Enabling night mode doesn't trigger browser restart prompt

[srirambv]

Description

Enabling night mode doesn't trigger browser restart prompt

Steps to reproduce

1. Install 1.15.54 x64 beta build via GPS/Side load
2. Go to Settings -> Appearance -> Toggle Enable "Night mode"(Experimental"
3. No browser restart prompt is shown
4. Manually restart the browser, still no dark mode on webview
5. Open chrome://flags, Force dark mode flag is not enabled

Actual result

https://youtu.be/bCaVXPnDfn0

Expected result

Should

Issue reproduces how often

Easy

Version/Channel Information:

• Can you reproduce this issue with the current Play Store version? NA
• Can you reproduce this issue with the current Play Store Beta version? Yes
• Can you reproduce this issue with the current Play Store Nightly version? Yes

Device details

• Install type (ARM, x86): ARM
• Device type (Phone, Tablet, Phablet): Samsung Tab A
• Android version: 10

Brave version

1.15.54 beta build

Website problems only

• 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

Additional information

[srirambv]

Verification passed on Samsung Tab A with Android 10 running 1.15.69 x64 build

• Verified enabling night mode triggers browser restart prompt
• Verified night mode is only enabled after browser restart
• Verified enabling night mode enables the flag as well under brave://flags