Remove GestureEvent interface, and rename GestureEventImpl to GestureEvent.

ash/wm/shelf_layout_manager.cc

Index: ash/wm/shelf_layout_manager.cc
diff --git a/ash/wm/shelf_layout_manager.cc b/ash/wm/shelf_layout_manager.cc
index a2b847eeaf43cbe8dbca8ed8ceea104d38784971..a621c4aa21ad1da62e3b064cddc248322e589f8d 100644
--- a/ash/wm/shelf_layout_manager.cc
+++ b/ash/wm/shelf_layout_manager.cc
@@ -67,7 +67,7 @@ class ShelfLayoutManager::AutoHideEventFilter : public aura::EventFilter {
       ui::TouchEvent* event) OVERRIDE;
   virtual ui::GestureStatus PreHandleGestureEvent(
       aura::Window* target,
-      ui::GestureEventImpl* event) OVERRIDE;
+      ui::GestureEvent* event) OVERRIDE;
 
  private:
   ShelfLayoutManager* shelf_;
@@ -116,7 +116,7 @@ ui::TouchStatus ShelfLayoutManager::AutoHideEventFilter::PreHandleTouchEvent(
 ui::GestureStatus
 ShelfLayoutManager::AutoHideEventFilter::PreHandleGestureEvent(
     aura::Window* target,
-    ui::GestureEventImpl* event) {
+    ui::GestureEvent* event) {
   return ui::GESTURE_STATUS_UNKNOWN;  // Not handled.
 }