AccountConsistencyMethod should default to disabled on Android

[jumde]

Description

Android defaults to Mirror as the account consistency method. This should be explicitly set to disabled till extensions are enabled on android.

Steps to reproduce

1. Navigate to brave://signin-internals

Actual result

account consistency method is Mirror

Expected result

account consistency method should be none

Issue reproduces how often

Easily

Version/Channel Information:

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

Device details

• Install type (ARM, x86):
• Device type (Phone, Tablet, Phablet):
• Android version:

Brave version

1.15.76

Website problems only

• 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?

Additional information

[jumde]

Fix reverted - causes DCHECK failure - brave/brave-core#7040

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.18.51 x64 beta build

• Verified Account Consistency is set to none
  

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Verification passed on Samsung Tab A with Android 10 running 1.18.51 x64 beta build

• Verified Account Consistency is set to none