Add version check to only register the DelegateExecute verb handler if Win8 build is 8370 or higher.
Add version check to only register the DelegateExecute verb handler if Win8 build is 8370 or higher.

This prevents us from launching Metro chrome on unsupported builds (launching from Start Screen simply defaults to desktop Chrome).


BUG=None
TEST=Chrome launches in Desktop from Start Screen on 8250 and to Metro in 8370.

Review URL: https://chromiumcodereview.appspot.com/10441012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@138919 0039d316-1c4b-4281-b951-d872f2087c98

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