Follow up of #8781 - Pinned sites are being duplicated after upgrade

[GeetaSarvadnya]

Description

Follow up of #8781 - Pinned sites are being duplicated after upgrade

Steps to Reproduce

1. Clen profile 1.7.x
2. Open 6 different sites
3. Pin 3 sites in NTP keep reaming 3 sites as it is
4. Upgrade to 1.8.x
5. On the existing NTP, 3 pinned tabs and remaining 3 unpinned tabs are shown correctly
6. Open a NTP
7. Out of 6 sites, 3 Pinned sites are duplicated and remaining 3 sites are lost in 1.8.x

Note: The issue is reproducible in both 1.7.92 and 1.7.95

Actual result:

3 Pinned sites are duplicated and remaining 3 sites are lost in 1.8.x

Before upgrade 1.7.x

After upgrade to 1.8.x

Expected result:

Pinned tabs and all other tabs remain the same after upgrade

Reproduces how often:

Always

Brave version (brave://version info)

Brave	1.8.77 Chromium: 81.0.4044.92 (Official Build) dev (64-bit)
Revision	e98e6f21168a55e7ba57202f56323911cd9d31d1-refs/branch-heads/4044@{#883}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

Version/Channel Information:

• Can you reproduce this issue with the current release? Not sure
• Can you reproduce this issue with the beta channel? Not sure
• Can you reproduce this issue with the dev channel? Yes
• Can you reproduce this issue with the nightly channel? Not sure

Other Additional Information:

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

Miscellaneous Information:

cc: @brave/legacy_qa @cezaraugusto @rebron

[GeetaSarvadnya]

Before upgrade in 1.7.92

After upgrade to 1.8.x

[bsclifton]

cc: @cezaraugusto - may be related to the fix you did for top site migration ☹️

[cezaraugusto]

@bsclifton this is fixed but needs uplift. brave/brave-core#5219

[bsclifton]

Closing as duplicate of #9008 😄