Hangouts extension should be off by default

[ShivanKaul]

Test plan

See brave/brave-core#24583

Description

While we explore removing the Hangouts extension completely in #39660, we should at least disable the extension by default for users who haven't touched the extension.

Steps to reproduce

1. Never having touched the Hangouts toggle...
2. Go to brave://settings/extensions
3. See Hangouts toggle

Actual result

It's on (by default)

Expected result

It should be off

As a corollary, we should not touch the toggle for users who have touched the toggle.

Reproduces how often

Easily reproduced

Desktop Brave version (brave://version info)

all

Android device

all

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

I think we want to disable in Nightly first and have it ride the trains.

[bsclifton]

Removed OS/Android - this should be desktop only (Android would require some work to support extensions).

[kjozwiak]

The above requires 1.67.133 or higher for 1.67.x verification 👍

[GeetaSarvadnya]

Verification PASSED on

Brave | 1.67.134 Chromium: 126.0.6478.186 (Official Build) (64-bit)
-- | --
Revision | e27c9744a0ed98bfa60e287af7e5eaffde15bd57
OS | Windows 10 Version 22H2 (Build 19045.4651)

Clean profile

• Confirmed that the extension Hangouts is disabled by default via brave://settings/extensions
  

Case 1: Upgrade, default - PASSED

1. installed 1.67.123
2. launched Brave (release)
3. opened brave://settings/extensions
4. confirmed Hangouts is toggled On/Enabled
5. upgraded to 1.67.134 by renaming Brave-Browser profile to Brave-Browser-Nightly
6. installed launched Brave 1.67.134
7. opened brave://settings/extensions

Confirmed Hangouts is toggled Off/Disabled

1.67.123	1.67.134

Case 2: Upgrade, user-modified setting - PASSED

1. installed and launched 1.67.123 (release)
2. opened brave://settings/extensions
3. toggled Hangouts from its default of Enabled to Disabled, and then finally toggled back to Enabled/On
4. installed 1.67.134
5. launched Brave
6. opened brave://settings/extensions
7. looked at the value for the Hangouts preference

Confirmed Hangouts was still set to Enabled/On

1.67.123	1.67.134

Case 3: Disabling the pref disables the extension - PASSED

Steps:

1. installed 1.67.123
2. launched Brave
3. opened brave://settings/extensions
4. confirmed Hangouts is set to Disabled/Off
5. opened brave://extensions-internals
6. grepped for DISABLE_BLOCKED_BY_DEFAULT
7. confirmed disable_reasons for the Hangouts extension ID nkeimhogjdpnpccoofpliimaahmaaome was set to the above
8. loaded google.com
9. opened the Developer Tools' Console
10. pasted the following snippet:

chrome.runtime.sendMessage(
  "nkeimhogjdpnpccoofpliimaahmaaome",
  { method: "cpu.getInfo" },
  (response) => {
    console.log(JSON.stringify(response, null, 2));
  },
);

11. confirmed I got the following error: Uncaught TypeError: Cannot read properties of undefined (reading "sendMessage") at <anonymous>:1:16

brave://settings/extensions	brave://extensions-internals	Google.com w/ Dev Console

Case 4: Enabling the pref allows the extension - PASSED

Steps:

1. installed 1.67.134
2. launched Brave
3. opened brave://settings/extensions
4. toggled Hangouts to Enabled/On
5. opened brave://extensions-internals
6. grepped for DISABLE_BLOCKED_BY_DEFAULT
7. confirmed disable_reasons is NOT present for the Hangouts extension ID nkeimhogjdpnpccoofpliimaahmaaome
8. loaded google.com
9. opened the Developer Tools' Console
10. pasted the following snippet:

chrome.runtime.sendMessage(
  "nkeimhogjdpnpccoofpliimaahmaaome",
  { method: "cpu.getInfo" },
  (response) => {
    console.log(JSON.stringify(response, null, 2));
  },
);

11. confirmed I got the following output, without errors:

 {
        "usage": {
          "idle": 1704610468750,
          "kernel": 14425000000,
          "total": 1757872812500,
          "user": 38837343750
        }
      }

brave://settings/extensions	brave://extensions-internals	Google.com w/ Dev Console