Remove GestureEvent interface, and rename GestureEventImpl to GestureEvent.

ash/magnifier/magnification_controller.cc

Index: ash/magnifier/magnification_controller.cc
diff --git a/ash/magnifier/magnification_controller.cc b/ash/magnifier/magnification_controller.cc
index 4a84ef467d07e0a1069cfdb9b91c7db6513f8c65..cf028cd67d6f42fd9346fc8d9c3ab7ead94c50e8 100644
--- a/ash/magnifier/magnification_controller.cc
+++ b/ash/magnifier/magnification_controller.cc
@@ -107,7 +107,7 @@ class MagnificationControllerImpl : virtual public MagnificationController,
       ui::TouchEvent* event) OVERRIDE;
   virtual ui::GestureStatus PreHandleGestureEvent(
       aura::Window* target,
-      ui::GestureEventImpl* event) OVERRIDE;
+      ui::GestureEvent* event) OVERRIDE;
 
   aura::RootWindow* root_window_;
 
@@ -454,7 +454,7 @@ ui::TouchStatus MagnificationControllerImpl::PreHandleTouchEvent(
 
 ui::GestureStatus MagnificationControllerImpl::PreHandleGestureEvent(
     aura::Window* target,
-    ui::GestureEventImpl* event) {
+    ui::GestureEvent* event) {
   return ui::GESTURE_STATUS_UNKNOWN;
 }