Cause the chrome frame helper process to attempt to close down all other chrome frame helper processes on launch (after setting its own hook).
Cause the chrome frame helper process to attempt to close down all other chrome frame helper processes on launch (after setting its own hook).

BUG=53127
TEST=You can't start more than one medium/low integrity chrome_frame_helper.exe per desktop.

Review URL: http://codereview.chromium.org/3371002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@58855 0039d316-1c4b-4281-b951-d872f2087c98

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