Sync chain creator does not get some bookmarks on initial sync

[btlechowski]

Steps to Reproduce

bookmarks: bookmarks.zip

Note: Windows is the sync chain creator

1. Clean install on Windows
2. On Windows: import attached bookmarks: bookmarks_windows.html
3. Clean install on Linux
4. On Linux: import attached bookmarks: bookmarks_linux.html
5. On Windows: Go to brave://sync/ and Start a new sync chain
6. On Windows: Click Computer and copy sync code
7. On Linux: Go to brave://sync/ and click I have a sync code
8. On Linux: Paste the sync code from 6.

Actual result:

Partial sync on Windows (sync chain creator)
Bookmarks from Linux are not synced or are synced partially

Full sync on Linux.

Expected result:

Full sync on Windows (sync chain creator)

Full sync on Linux.

Reproduces how often:

Easily reproduced

Brave version (brave://version info)

Brave	0.59.33 Chromium: 72.0.3626.81 (Official Build) (64-bit)
Revision	ac8b982e05014492d1bd7d317628a4f22a97ffa0-refs/branch-heads/3626@{#796}
OS	Windows 7 & Linux

The regression was introduced between 0.59.21 and 0.59.25.

Found by @LaurenWags .

cc @brave/legacy_qa @rebron @AlexeyBarabash @darkdh

[darkdh]

@AlexeyBarabash it is caused by brave/brave-core#1188

[srirambv]

Verification passed on

Brave	0.59.34 Chromium: 72.0.3626.81 (Official Build) (64-bit)
Revision	ac8b982e05014492d1bd7d317628a4f22a97ffa0-refs/branch-heads/3626@{#796}
OS	Linux

• Verification passed on different profiles on Linux, full bookmarks sync on both profiles
• Verification passed on different profiles on Linux and Windows, full bookmarks sync on both profiles
  

Verification passed on

Brave	0.59.34 Chromium: 72.0.3626.81 (Official Build) (64-bit)
Revision	ac8b982e05014492d1bd7d317628a4f22a97ffa0-refs/branch-heads/3626@{#796}
OS	Windows 10

• Verified the STR mentioned in the description. Able to see full bookmarks sync on both win and linux
  

Verified passed with

Brave	0.59.34 Chromium: 72.0.3626.81 (Official Build) (64-bit)
Revision	ac8b982e05014492d1bd7d317628a4f22a97ffa0-refs/branch-heads/3626@{#796}
OS	Mac OS X

• Verified by having a macOS device with bookmarks and an Android device with bookmarks. After bookmarks were set up on both devices, a sync chain was created on macOS and joined by Android. Verified bookmarks from each devices synced to the other device.
• Verified by having two macOS devices with bookmarks. After bookmarks were set up on both devices, a sync chain was created on macOS1 and joined by macOS2. Verified bookmarks from each devices synced to the other device.

Verification passed on

Brave	0.59.34 Chromium: 72.0.3626.81 (Official Build) (64-bit)
Revision	ac8b982e05014492d1bd7d317628a4f22a97ffa0-refs/branch-heads/3626@{#796}
OS	Windows 7

[kjozwiak]

Moving this into https://github.com/brave/brave-browser/milestone/15 as it was resolved by reverting brave/brave-core#1188 and pushed into the 0.59.34 release.