base: Remove usage of ALLOW_THIS_IN_INITIALIZER_LIST macro.

See discussion in chromium-dev mailing list:
https://groups.google.com/a/chromium.org/forum/?fromgroups#!topic/chromium-dev/2EdybzAxSu8

The consensul was to remove it as it hasn't been providing us much value.

BUG=234765
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Review URL: https://chromiumcodereview.appspot.com/14471006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@196383 0039d316-1c4b-4281-b951-d872f2087c98
8 files changed