When uninstalling, only attempt to unregister DLLs if in ChromeFrame mode.
When uninstalling, only attempt to unregister DLLs if in ChromeFrame mode.

BUG=53135
TEST=When uninstalling Chrome, there are no DLL unregistration messages in the uninstall log.

Review URL: http://codereview.chromium.org/3461001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@59648 0039d316-1c4b-4281-b951-d872f2087c98

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