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These two dialogs host web contents modal dialogs on their WebContents,
so they need to implement the WebContentsModalDialogManagerDelegate
and WebContentsModalDialogHost interfaces to provide dialog host view
and positioning.

BUG=244173

Review URL: https://chromiumcodereview.appspot.com/15879007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202948 0039d316-1c4b-4281-b951-d872f2087c98