[CR121] - New tab button (+) is misaligned on upgrade from C120 -> C121 and in new install as well

[MadhaviSeelam]

Description

Found while testing #35281. This issue is not present in CR 120 (Current release 1.61.116 Chromium: 120.0.6099.217 or Latest nightly 1.63.113 Chromium: 120.0.6099.217. It is shown when upgraded from CR 120 ->CR 121. Fresh Install from CR121 nightly builds have no issues.

Steps to Reproduce

1. Install 1.63.113 Chromium: 120.0.6099.217
2. launch Brave
3. upgrade to 1.63.110 Chromium: 121.0.6167.57 via brave://settings/help
4. open a new tab (`+)

Actual result:

(+) is misaligned.

example	example

Expected result:

parity with [CR120]

Reproduces how often:

Easily

Brave version (brave://version info)

Brave | 1.63.110 Chromium: 121.0.6167.57 (Official Build) nightly (64-bit)
-- | --
Revision | f7a7c2ee42626f5a1310c9bd6789d0438e78ca6e
OS | Windows 11 Version 22H2 (Build 22621.3007)

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 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:

@mkarolin @rebron
cc: @brave/qa-team

[rebron]

cc: @zenparsing

[simonhong]

Fixing now.

[mowny]

While you're at it, is it intentional that there is so much space between the + and the tab dropdown?

And is it normal that there is no overflow indication? If I open even more tabs, they get hidden "behind" the + and I can only get to them by ctrl-tab or the dropdown. That wasted space could display at least 4 more tabs ;)

[kjozwiak]

Labelling as QA/Blocked as this also needs to be uplifted into 1.62.x which will happen once brave/brave-core#21593 has been uplifted/merged into 1.62.x.

[kjozwiak]

The above requires 1.62.148 or higher for 1.62.x verification 👍

[GeetaSarvadnya]

Verification PASSED on

Brave | 1.62.149 Chromium: 121.0.6167.75 (Official Build) (64-bit)
-- | --
Revision | ff84587bd70af9fcbcbe59fc5194ca65082759c4
OS | Windows 10 Version 22H2 (Build 19045.3930)

• Confirmed that the new tab + is aligned correctly in both clean and upgraded profiles.

Clean profile

Regular window	Private window	TOR window

Upgrade profile

1.61.120	1.62.149