[Mac] Placate the stupid compiler.

chrome/browser/ui/cocoa/draggable_button.mm

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/draggable_button.h"
 
 #include "base/logging.h"
 
 @implementation DraggableButton
 
@@ skipping 11 matching lines @@
         [[DraggableButtonImpl alloc] initWithButton:self]);
   }
   return self;
 }
 
 - (DraggableButtonImpl*)draggableButton {
   return draggableButtonImpl_.get();
 }
 
 - (void)mouseUp:(NSEvent*)theEvent {
-  if ([draggableButtonImpl_ mouseUp:theEvent] == kDraggableButtonMixinCallSuper)
+  if ([draggableButtonImpl_ mouseUpImpl:theEvent] ==
+          kDraggableButtonMixinCallSuper) {
     [super mouseUp:theEvent];
+  }
 }
 
 - (void)mouseDown:(NSEvent*)theEvent {
-  if ([draggableButtonImpl_ mouseDown:theEvent] ==
+  if ([draggableButtonImpl_ mouseDownImpl:theEvent] ==
           kDraggableButtonMixinCallSuper) {
     [super mouseDown:theEvent];
   }
 }
 
 - (void)beginDrag:(NSEvent*)dragEvent {
   // Must be overridden by subclasses.
   NOTREACHED();
 }
 
 @end  // @interface DraggableButton