Fix a ChromeFrame crash which occurs while handling the open url notification from Chrome. This crash
happens while attempting to dereference a NULL IWebBrowser2 interface pointer, which could occur if
the client site is NULL, i.e. chrome frame is in the process of being torn down.

This fixes bug http://code.google.com/p/chromium/issues/detail?id=40174

Bug=40174

Review URL: http://codereview.chromium.org/1585014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@43457 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed