Duplicate sync object id of bookmarks

[darkdh]

Description

If user copy bookmark, then meta infos are also copied. That will lead to same object id for multiple bookmarks

Steps to Reproduce

1. Go to about:flags#brave-sync and enable sync
2. Create a sync chain
3. Go to brave://bookmarks/
4. Add a bookmark
5. Go to about:flags#brave-sync and disable sync
6. COPY the bookmark
7. Go to about:flags#brave-sync and enable sync
8. Browser crashes and keep crashing on startup
9. There is same object id for these two bookmarks in Bookmarks in user profile

Actual result:

browser crashes

0  Brave Browser Framework! [synced_bookmark_tracker.cc : 500 + 0x0]
1  Brave Browser Framework!sync_bookmarks::BookmarkModelTypeProcessor::OnCommitCompleted(sync_pb::ModelTypeState const&, std::__1::vector > const&) [bookmark_model_type_processor.cc : 227 + 0x8]

https://stats.brave.com/dashboard#crash/5e4d7b0f9562f600667c9b55

And duplicate object id for different bookmarks

Expected result:

No crash and no duplicate object id

Reproduces how often:

100% reproducible

Brave version (brave://version info)

80.1.3.118

Version/Channel Information:

• Can you reproduce this issue with the current release? Yes
• Can you reproduce this issue with the beta channel? Yes
• Can you reproduce this issue with the dev channel? Yes
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

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

Miscellaneous Information:

[GeetaSarvadnya]

Verification passed on

Brave	1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)
Revision	fcea73228632975e052eb90fcf6cd1752d3b42b4-refs/branch-heads/3987@{#974}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified STR from the description
• Verified that brave didn't crash when the sync is enabled and disabled multiple times using the flag about:flags#brave-sync

Verification passed on

Brave	1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)
Revision	fcea73228632975e052eb90fcf6cd1752d3b42b4-refs/branch-heads/3987@{#974}
OS	Ubuntu 18.04 LTS

• Reproduced on 1.4.95
• Verified test plan from the description. No crash.

Verified passed with

Brave	1.4.96 Chromium: 80.0.3987.132 (Official Build) (64-bit)
Revision	fcea73228632975e052eb90fcf6cd1752d3b42b4-refs/branch-heads/3987@{#974}
OS	macOS Version 10.14.6 (Build 18G3020)

• Reproduced the issue on 1.4.95
• Verified the STR from the description on a clean profile, no crash on startup observed
• Encountered Fix desktop profiles which are crashing because of sync object id duplication #8358 while trying to test this on an upgrade profile