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This CL modifies ProtocolHandlerRegistry to enable addition of policy for registering and ignoring protocol handlers. The current implementation does not allow it since it saves the registered handlers, which would result in policy leak when directly mapped, i.e., protocol handler registered via policy would be saved to disk and mixed with user preference.

BUG=116119

TBR=koz,jochen

Review URL: https://codereview.chromium.org/293983004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274223 0039d316-1c4b-4281-b951-d872f2087c98