Device creates a new sync chain when using existing code words

[srirambv]

Description

Device creates a new sync chain when using existing code words

Devices

Device 1: Ubuntu (Sync chain creator)
Device 2: Windows 10 (Also sync chain creator)

Steps to Reproduce

1. Create sync chain on device 1
2. Copy code words from device 1
3. Launch brave with sync parameter on device 2
4. Select I have an sycn chain code option on device 2
5. Paste the code words from step 2
6. Enter device 2 name and click sync, disconnect from network instantly
7. Reconnect device 2 to network and try sync again, nothing happens (Sync chain creation fails after system comes online #2137)
8. Relaunch browser, sync chain is created on device 2 as well but doesn't list device 1
9. Check for code words on device 2, has a new set of code words from device 1

Actual result:

https://youtu.be/_Rp_uH6egYE

Expected result:

Should join existing sync chain when using code words and not create a different sync chain

Reproduces how often:

Easy

Brave version (brave://version info)

Brave	0.57.6 Chromium: 71.0.3578.31 (Official Build) beta (64-bit)
Revision	c88fdf2a4ce19a713615ca4fbde7a0d0b5fe2363-refs/branch-heads/3578@{#427}
OS	Windows/Linux

Reproducible on current release:

• Does it reproduce on brave-browser dev/beta builds?
  Yes on beta build

Website problems only:

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

Additional Information

cc: @AlexeyBarabash @darkdh @brave/legacy_qa

[btlechowski]

Verification passed on

Brave	0.58.11 Chromium: 71.0.3578.80 (Official Build) beta (64-bit)
Revision	2ac50e7249fbd55e6f517a28131605c9fb9fe897-refs/branch-heads/3578@{#860}
OS	Windows 7 x64

Used STR from OP.

Verified passed with

Brave	0.58.12 Chromium: 71.0.3578.80 (Official Build) (64-bit)
Revision	2ac50e7249fbd55e6f517a28131605c9fb9fe897-refs/branch-heads/3578@{#860}
OS	Mac OS X

• Verified STR from description (Device 1 is macOS, Device 2 is Linux VM)

Verification passed on

Brave	0.59.14 Chromium: 72.0.3626.28 (Official Build) beta(64-bit)
Revision	997b1040b63bac324e815797ba52be0cd8f616ed-refs/branch-heads/3626@{#461}
OS	Linux

Used STR from OP.