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This patch adds an API so that the platform can clear the HTTP auth cache
at will. This can be useful when clearing private browsing data to prevent
cached credentials from being re-used.

BUG=63723

Review URL: https://codereview.chromium.org/351833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282944 0039d316-1c4b-4281-b951-d872f2087c98