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Mousewheel events, like keyboard events and unlike other mouseevents, are sent
to the focused view from the focus-manager, instead of sending to the view at
the location of the LocatedEvent. So This needs to be handled from the
dekstop/window-manager to send the events to the focused window.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7462017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96271 0039d316-1c4b-4281-b951-d872f2087c98