Revert of Enabling watchdog mailing list (watchdog-blink-watchlist@google.com) to monitor (https://codereview.chromium.org/68893015/)

Reason for revert:
We do not want to track Activity Logger changes with watchdog-blink-watchlist@google.com. It proved not effective strategy and is not needed after Activity Logger refactoring work and adding Activity Logger tests.

Original issue's description:
> Enabling watchdog mailing list (watchdog-blink-watchlist@google.com) to monitor
> changes that may impact the activity logger and watchdog extension.
> 
> These files are core web idl files, a few files that support activity logging,
> and the code_generator_v8.pm file.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=162031

Review URL: https://codereview.chromium.org/371463008

git-svn-id: svn://svn.chromium.org/blink/trunk@177534 bbb929c8-8fbe-4397-9dbb-9b2b20218538