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This is to avoid skipping "meta viewport" tag processing.

For controlling wide viewport-related behavior, a corresponding
WebSetting has been added into Blink.

Review URL: https://codereview.chromium.org/14234002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194576 0039d316-1c4b-4281-b951-d872f2087c98