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This CL also:
* Adds unit tests for InputFilter and CLipboardFilter.
* Updates ClientSession to enabled/disable filters for authentication.

BUG=118511


Review URL: https://chromiumcodereview.appspot.com/10860033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152418 0039d316-1c4b-4281-b951-d872f2087c98