Use GetForegroundWindow instead of GetActiveWindow because the former works on all threads.
Use GetForegroundWindow instead of GetActiveWindow because the former works on
all threads.

BUG=13914
TEST=install an extension an make sure the install dialog window shows up in front of
the Chrome window.
Review URL: http://codereview.chromium.org/125077

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@18430 0039d316-1c4b-4281-b951-d872f2087c98

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