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Write the ActiveX control from an external script in all test documents.  This works around a "feature" of IE versions released between April, 2006 and April, 2008 that required the user to click on an ActiveX control to "activate" it.  See http://msdn.microsoft.com/en-us/library/ms537508.aspx.

I also added asserts for the copying of CFInstance and CFInstall so that the whole test aborts if the files can't be copied, since otherwise test results are bogus.

BUG=60987
TEST=no manual testing needed; chrome_frame_tests.exe will either become better or worse.

Review URL: http://codereview.chromium.org/8777002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113291 0039d316-1c4b-4281-b951-d872f2087c98