1. Remove mDeferMultiTouch in WebView, it was for testing only but we don't need it now since we always pass MultiTouch to WebKit. 2. Remove the use of mDeferMultiTouch in DRT tests. 3. Correct the index of getX(Y) for the second touch point in the debug string of MotionEvent. Change-Id: Ib63cfc5935af1a169ed26b2b138f74908492bc18