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the content area.

Also fixes a bug where the account reconcilor would run concurrent
MergeSessions on startup if there are multiple accounts connected to the
profile.  This led to a race condition that could mess up the gaia cookie.

Added more tests to  GoogleAutoLoginHelper.

BUG=315269

Review URL: https://codereview.chromium.org/110373007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244044 0039d316-1c4b-4281-b951-d872f2087c98