Update chrome/renderer/external_host_bindings.cc to reflect WEBKIT_FRAME_TO_DOCUMENT_API_MOVE
Update chrome/renderer/external_host_bindings.cc to reflect WEBKIT_FRAME_TO_DOCUMENT_API_MOVE

While I was in this code, I couldn't help remove a fake implementation of
WebSecurityOrigin::toString().

Review URL: http://codereview.chromium.org/7237015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@90324 0039d316-1c4b-4281-b951-d872f2087c98

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