Guard against NULL webview in dispatchDidFinishDocumentLoad. The webview can be NULL if dispatchDidFinishDocumentLoad is called via a frame destructor.
Guard against NULL webview in dispatchDidFinishDocumentLoad. The
webview can be NULL if dispatchDidFinishDocumentLoad is called via a
frame destructor.

BUG=20324
TEST=LayoutTests/http/tests/security/javascriptURL/javascriptURL-in-new-iframe.html
Review URL: http://codereview.chromium.org/194022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@25596 0039d316-1c4b-4281-b951-d872f2087c98

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