NTP SI crashes for non-US region

[LaurenWags]

Description

Found while testing brave/brave-core#4075

Test plan 4 from above PR fails, browser crashes when OS is set to something other that US (ex. Canada or UK)

Steps to Reproduce

Reproduced below using Canada and UK. Note, if in a non-ads region, like Aruba, issue does not reproduce.

4. Blank Remote content is fetched and parsed

(only works whilst in pre-release phase)
0. Fresh or previous profile
0. System OS region set to "Canada"

1. Visit chrome://flags and turn on only the "Branded Wallpapers" feature flag
2. Relaunch browser
3. Refresh NTP more than 5 times. NO sponsored background image should be seen.

When retesting, retest on both clean and upgrade profiles.

Actual result:

Brave crashes on second new tab or refresh. See Uploaded Crash Report ID cbec1ecd57eec1da

Expected result:

No crash

Reproduces how often:

easily

Brave version (brave://version info)

Brave	1.5.62 Chromium: 79.0.3945.130 (Official Build) nightly (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	macOS Version 10.14.6 (Build 18G103)

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a
• Can you reproduce this issue with the beta channel? n/a
• Can you reproduce this issue with the dev channel? n/a
• Can you reproduce this issue with the nightly channel? yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? n/a
• Does the issue resolve itself when disabling Brave Rewards? n/a
• Is the issue reproducible on the latest version of Chrome? n/a

Miscellaneous Information:

cc @brave/legacy_qa @petemill

[btlechowski]

Reproduced on Windows 7 and 10

Brave	1.5.62 Chromium: 79.0.3945.130 (Official Build) nightly (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	Windows 7 Service Pack 1 (Build 7601.24544)

Uploaded Crash Report ID 64b9a1ffb0cbd0ae (Local Context: 537bfd37-d0ac-4677-9842-445e0e23a298)
Uploaded Crash Report ID 80a15212603bb381 (Local Context: a6768b09-2527-4059-b8b3-d9b304bdbcfd)

Brave	1.5.62 Chromium: 79.0.3945.130 (Official Build) nightly (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	Windows 10 OS Version 1909 (Build 18363.592)

Uploaded Crash Report ID a8b44efa813a2991 (Local Context: d513fb1f-a63b-470a-bbe4-c1bc6cc7c43b)

[GeetaSarvadnya]

Reproduced in Windows 10 x64

Brave	1.5.63 Chromium: 79.0.3945.130 (Official Build) nightly (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

[GeetaSarvadnya]

Verification passed on

Brave	1.3.106 Chromium: 79.0.3945.130 (Official Build) beta (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified the STR mentioned in the description
• Verified for Canada, UK and Autralia - No crash
• Verified both clean and upgraded profiles

Verification passed on

Brave	1.3.108 Chromium: 79.0.3945.130 (Official Build) beta (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	Ubuntu 18.04 LTS

• Verified the STR mentioned in the description
• Verified for Canada, UK and Autralia - No crash
• Verified both clean and upgraded profiles

Verification PASSED on macOS 10.15.3 x64 using the following build:

Brave	1.3.108 Chromium: 79.0.3945.130 (Official Build) beta (64-bit)
Revision	e22de67c28798d98833a7137c0e22876237fc40a-refs/branch-heads/3945@{#1047}
OS	macOS Version 10.15.3 (Build 19D76)

• Reproduced the original issue using 1.5.62 Chromium: 79.0.3945.130 (Official Build) nightly
• Verified that the STR outlined under NTP SI crashes for non-US region #7928 (comment) worked as expected and didn't crash Brave.
• ensured that NTP SI assets are not being displayed
• went through the above cases on both a clean install and an upgraded profile
• went through the above cases using Canada, UK, Germany, France