Remove GestureEvent interface, and rename GestureEventImpl to GestureEvent.

ui/base/gestures/gesture_types.h

Index: ui/base/gestures/gesture_types.h
diff --git a/ui/base/gestures/gesture_types.h b/ui/base/gestures/gesture_types.h
index 48dae701f134e6f2d18a95bdd0fd6e2b62176d0c..caab89240435bd50e87f28f2a232cfd5234661e6 100644
--- a/ui/base/gestures/gesture_types.h
+++ b/ui/base/gestures/gesture_types.h
@@ -12,6 +12,7 @@
 
 namespace ui {
 
+class GestureEvent;
 class TouchEvent;
 
 struct UI_EXPORT GestureEventDetails {
@@ -115,25 +116,6 @@ struct UI_EXPORT GestureEventDetails {
   gfx::Rect bounding_box_;
 };
 
-// An abstract type to represent gesture-events.
-class UI_EXPORT GestureEvent {
- public:
-  virtual ~GestureEvent() {}
-
-  // A gesture event can have multiple touches. This function should return the
-  // lowest ID of the touches in this gesture.
-  virtual int GetLowestTouchId() const = 0;
-
-  // A helper function used in several (all) derived classes.
-  // Returns lowest set bit, or -1 if no bits are set.
-  static int LowestBit(unsigned int bitfield) {
-    int i = -1;
-    // Find the index of the least significant 1 bit
-    while (bitfield && (!((1 << ++i) & bitfield)));
-    return i;
-  }
-};
-
 // An abstract type for consumers of gesture-events created by the
 // gesture-recognizer.
 class UI_EXPORT GestureConsumer {