Crash in latest master build

[jonathanKingston]

So I am getting the following crash:

[3599:3599:0207/211544.854965:ERROR:sandbox_linux.cc(374)] InitializeSandbox() called with multiple threads in process gpu-process.
[3573:3614:0207/211546.639059:ERROR:ads_service_impl.cc(211)] Failed to read file: /home/jonathan/.config/BraveSoftware/Brave-Browser-Development/Default/ads_service/notifications.json
[3608:1:0207/211546.639374:ERROR:notifications.cc(301)] Failed to load notifications state, resetting to default values
[3573:3614:0207/211546.639709:ERROR:ads_service_impl.cc(211)] Failed to read file: /home/jonathan/.config/BraveSoftware/Brave-Browser-Development/Default/ads_service/ad_conversions.json
[3608:1:0207/211546.639890:ERROR:ad_conversion_tracking.cc(279)] Failed to load ad conversions state, resetting to default values
[3573:3593:0207/211547.358778:ERROR:bundle_state_database.cc(567)] DB: Error migrating database from v3 to v4
[3573:3593:0207/211547.358809:FATAL:bundle_state_database.cc(248)] Check failed: initialized. 
#0 0x7f709bb67869 base::debug::CollectStackTrace()
#1 0x7f709ba42173 base::debug::StackTrace::StackTrace()
#2 0x7f709ba647a4 logging::LogMessage::~LogMessage()
#3 0x55ad957ee2f7 brave_ads::BundleStateDatabase::SaveBundleState()
#4 0x55ad957e6607 brave_ads::(anonymous namespace)::SaveBundleStateOnFileTaskRunner()
#5 0x55ad957ea396 base::internal::Invoker<>::RunOnce()
#6 0x55ad954aba10 base::internal::ReturnAsParamAdapter<>()
#7 0x55ad952035a7 base::internal::Invoker<>::RunOnce()
#8 0x7f709bb1abcd base::(anonymous namespace)::PostTaskAndReplyRelay::RunTaskAndPostReply()
#9 0x7f709bb1b089 base::internal::Invoker<>::RunOnce()
#10 0x7f709bad3342 base::TaskAnnotator::RunTask()
#11 0x7f709bb0a8f2 base::internal::TaskTracker::RunBlockShutdown()
#12 0x7f709bb0a076 base::internal::TaskTracker::RunTask()
#13 0x7f709bb83894 base::internal::TaskTrackerPosix::RunTask()
#14 0x7f709bb09626 base::internal::TaskTracker::RunAndPopNextTask()
#15 0x7f709bb1734e base::internal::WorkerThread::RunWorker()
#16 0x7f709bb170c4 base::internal::WorkerThread::RunPooledWorker()
#17 0x7f709bb843a8 base::(anonymous namespace)::ThreadFunc()
#18 0x7f708cce0669 start_thread
#19 0x7f708c57a323 clone
Task trace:
#0 0x55ad957e64d4 brave_ads::AdsServiceImpl::SaveBundleState()
#1 0x7f709b6c41ad mojo::SimpleWatcher::Context::Notify()
IPC message handler context: 0x01C9E278

Received signal 6
#0 0x7f709bb67869 base::debug::CollectStackTrace()
#1 0x7f709ba42173 base::debug::StackTrace::StackTrace()
#2 0x7f709bb67321 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#3 0x7f708ccec540 <unknown>
#4 0x7f708c49e3eb gsignal
#5 0x7f708c47d899 abort
#6 0x7f709bb65f75 base::debug::BreakDebugger()
#7 0x7f709ba64cea logging::LogMessage::~LogMessage()
#8 0x55ad957ee2f7 brave_ads::BundleStateDatabase::SaveBundleState()
#9 0x55ad957e6607 brave_ads::(anonymous namespace)::SaveBundleStateOnFileTaskRunner()
#10 0x55ad957ea396 base::internal::Invoker<>::RunOnce()
#11 0x55ad954aba10 base::internal::ReturnAsParamAdapter<>()
#12 0x55ad952035a7 base::internal::Invoker<>::RunOnce()
#13 0x7f709bb1abcd base::(anonymous namespace)::PostTaskAndReplyRelay::RunTaskAndPostReply()
#14 0x7f709bb1b089 base::internal::Invoker<>::RunOnce()
#15 0x7f709bad3342 base::TaskAnnotator::RunTask()
#16 0x7f709bb0a8f2 base::internal::TaskTracker::RunBlockShutdown()
#17 0x7f709bb0a076 base::internal::TaskTracker::RunTask()
#18 0x7f709bb83894 base::internal::TaskTrackerPosix::RunTask()
#19 0x7f709bb09626 base::internal::TaskTracker::RunAndPopNextTask()
#20 0x7f709bb1734e base::internal::WorkerThread::RunWorker()
#21 0x7f709bb170c4 base::internal::WorkerThread::RunPooledWorker()
#22 0x7f709bb843a8 base::(anonymous namespace)::ThreadFunc()
#23 0x7f708cce0669 start_thread
#24 0x7f708c57a323 clone
  r8: 0000000000000000  r9: 00007f70780552a0 r10: 0000000000000008 r11: 0000000000000246
 r12: 00007f7078055500 r13: aaaaaaaaaaaaaaaa r14: 00007f70780565b8 r15: 00002564f996ca00
  di: 0000000000000002  si: 00007f70780552a0  bp: 00007f70780554f0  bx: 00007f7078058700
  dx: 0000000000000000  ax: 0000000000000000  cx: 00007f708c49e3eb  sp: 00007f70780552a0
  ip: 00007f708c49e3eb efl: 0000000000000246 cgf: 002b000000000033 erf: 0000000000000000
 trp: 0000000000000000 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]
Calling _exit(1). Core file will not be generated.
null
null
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! brave@1.6.11 start: `node ./scripts/commands.js start "--enable-ui-devtools" "--force-fieldtrial-params=AutoupgradeMixedContent.Enabled:mode/no-images"`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the brave@1.6.11 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/jonathan/.npm/_logs/2020-02-07T21_15_47_402Z-debug.log

• brave_browser: 1.6.11 fb539af
• brave_core: 1.6.11 0a6249e
• chrome: 86f7c91cf23bceaaeebbd6a0d1d46626ac68d924

[jonathanKingston]

This appears to be an issue from #7888 migration changes.

[btlechowski]

Verification passed on

Brave	1.7.70 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	Ubuntu 18.04 LTS

Verified test plan from brave/brave-core#4558. Watched an ad on 1.5.x and upgraded to 1.7.x. No crash. No DB: Error migrating database.

Verification passed on

Brave	1.7.71 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified test plan from Fix crash in brave_ads migration brave-core#4558. Watched an ad on 1.5.x and upgraded to 1.7.x. No crash. No DB: Error migrating database.

Verified passed with

Brave	1.7.78 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	macOS Version 10.14.6 (Build 18G3020)

• Verified test plan from Fix crash in brave_ads migration brave-core#4558. Watched an ad on 1.5.x and upgraded to 1.7.x. No crash. No DB: Error migrating database message in the terminal. Tried 3x.