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This change causes us to not process any headers unless they are correctly
terminated with a \r\n\r\n sequence.

BUG=244260

Review URL: https://chromiumcodereview.appspot.com/15688012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202927 0039d316-1c4b-4281-b951-d872f2087c98