ObserverList.removeObserver() should not return true when null is being removed.

BUG=None

Review URL: https://codereview.chromium.org/188783002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256057 0039d316-1c4b-4281-b951-d872f2087c98
Remove the --automation-reinitialize-on-channel-error flag

BUG=350536

Review URL: https://codereview.chromium.org/191003005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256058 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256058