Remove GestureEvent interface, and rename GestureEventImpl to GestureEvent.

ui/base/event.cc

Index: ui/base/event.cc
diff --git a/ui/base/event.cc b/ui/base/event.cc
index 8a57e70ae7cf41d017b53816ee62914e0003803d..28392362d63e79307e926c40bc142aa5f3a147d0 100644
--- a/ui/base/event.cc
+++ b/ui/base/event.cc
@@ -373,23 +373,23 @@ ScrollEvent::ScrollEvent(const base::NativeEvent& native_event)
   }
 }
 
-GestureEventImpl::GestureEventImpl(EventType type,
-                                   int x,
-                                   int y,
-                                   int flags,
-                                   base::Time time_stamp,
-                                   const GestureEventDetails& details,
-                                   unsigned int touch_ids_bitfield)
+GestureEvent::GestureEvent(EventType type,
+                           int x,
+                           int y,
+                           int flags,
+                           base::Time time_stamp,
+                           const GestureEventDetails& details,
+                           unsigned int touch_ids_bitfield)
     : LocatedEvent(type, gfx::Point(x, y), gfx::Point(x, y), flags),
       details_(details),
       touch_ids_bitfield_(touch_ids_bitfield) {
   set_time_stamp(base::TimeDelta::FromSeconds(time_stamp.ToDoubleT()));
 }
 
-GestureEventImpl::~GestureEventImpl() {
+GestureEvent::~GestureEvent() {
 }
 
-int GestureEventImpl::GetLowestTouchId() const {
+int GestureEvent::GetLowestTouchId() const {
   if (touch_ids_bitfield_ == 0)
     return -1;
   int i = -1;