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This is to stop people accidentally using the ERROR macro for other uses,
e.g. VLOG(ERROR) is not meaningful.

BUG=

Review URL: https://chromiumcodereview.appspot.com/11669010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175998 0039d316-1c4b-4281-b951-d872f2087c98