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This CL adds a method to content::Referrer that allows for sanitizing the referrer before making a network request and uses it to scrub the Referer header for requests originating in the context menu.
It is based on work started by cbentzel@ in https://codereview.chromium.org/277903002/.

BUG=357473

Review URL: https://codereview.chromium.org/438283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287579 0039d316-1c4b-4281-b951-d872f2087c98