Remove handlers for user gesture callbacks

Source/platform/UserGestureIndicator.h

Index: Source/platform/UserGestureIndicator.h
diff --git a/Source/platform/UserGestureIndicator.h b/Source/platform/UserGestureIndicator.h
index c69d866d89b3083ed9b75b6c22f2dad45d0ba594..5281bf6909ea33c17e6c33dd5b9a332ef4b471d5 100644
--- a/Source/platform/UserGestureIndicator.h
+++ b/Source/platform/UserGestureIndicator.h
@@ -42,12 +42,6 @@ enum ProcessingUserGestureState {
     DefinitelyNotProcessingUserGesture
 };
 
-class UserGestureHandler {
-public:
-    virtual ~UserGestureHandler() { }
-    virtual void onGesture() = 0;
-};
-
 class PLATFORM_EXPORT UserGestureToken : public RefCounted<UserGestureToken> {
 public:
     virtual ~UserGestureToken() { }
@@ -74,7 +68,6 @@ public:
     static bool processingUserGesture();
     static bool consumeUserGesture();
     static UserGestureToken* currentToken();
-    static void setHandler(UserGestureHandler*);
 
     explicit UserGestureIndicator(ProcessingUserGestureState);
     explicit UserGestureIndicator(PassRefPtr<UserGestureToken>);
@@ -84,7 +77,6 @@ public:
 private:
     static ProcessingUserGestureState s_state;
     static UserGestureIndicator* s_topmostIndicator;
-    static UserGestureHandler* s_handler;
     ProcessingUserGestureState m_previousState;
     RefPtr<UserGestureToken> m_token;
 };