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If the user has third party cookies blocked and a piece of Chrome's
web ui needs to make an XHR to a logged in Google service (for
example Print Preview talking to Cloud Print) the cookies would be
blocked in the request.
Consensus on chromium-dev is that content block settings like this
should not apply to chrome UI.

Also adds unit tests for ShouldAllowAllContent.

BUG=136391
TEST=Unit tests should pass. Verify 136391.


Review URL: https://chromiumcodereview.appspot.com/10826089

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149317 0039d316-1c4b-4281-b951-d872f2087c98