Remove GestureEvent interface, and rename GestureEventImpl to GestureEvent.

ui/aura/root_window_unittest.cc

Index: ui/aura/root_window_unittest.cc
diff --git a/ui/aura/root_window_unittest.cc b/ui/aura/root_window_unittest.cc
index c236ea4d5ba1b5a9f3e076727ad9afb2bcd3c059..48b3743fd5105f797ef9865561a09189ba3fa537 100644
--- a/ui/aura/root_window_unittest.cc
+++ b/ui/aura/root_window_unittest.cc
@@ -95,7 +95,7 @@ class EventCountFilter : public EventFilter {
     return ui::TOUCH_STATUS_UNKNOWN;
   }
   virtual ui::GestureStatus PreHandleGestureEvent(
-      Window* target, ui::GestureEventImpl* event) OVERRIDE {
+      Window* target, ui::GestureEvent* event) OVERRIDE {
     return ui::GESTURE_STATUS_UNKNOWN;
   }
 
@@ -374,7 +374,7 @@ class EventFilterRecorder : public EventFilter {
   }
   virtual ui::GestureStatus PreHandleGestureEvent(
       Window* target,
-      ui::GestureEventImpl* event) OVERRIDE {
+      ui::GestureEvent* event) OVERRIDE {
     events_.push_back(event->type());
     return ui::GESTURE_STATUS_UNKNOWN;
   }