Allow up/down arrow keys to scroll the page in patch view

Several users asked that the browser default behavior for the up/down
arrow keys be restored when looking at a patch in the side by side or
unified diff views.  By overridding the method and returning false we
permit the key listener to leave the event for the browser to handle.

Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed