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was a bad idea because of its significant dependencies on NavigationController
and NavigationEntry. I'm trying to make renderer_host not depend on tab_contents
at all.

Remove the dependency on TabContents pointers for notifications from the
ResourceDispatcherHost. Instead of having the broadcast code in the
ResourceDispatcherHost, I made it call a RenderViewHostDelegate callback. Then
TabContents implements the notification, so that it's really from the
TabContents.
Review URL: http://codereview.chromium.org/150069

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19909 0039d316-1c4b-4281-b951-d872f2087c98