[Mac] Placate the stupid compiler.

chrome/browser/ui/cocoa/draggable_button_mixin.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 <cmath>
 
 #include "base/logging.h"
 #import "base/memory/scoped_nsobject.h"
@@ skipping 46 matching lines @@
     button_ = button;
     draggable_ = YES;
     actsOnMouseDown_ = NO;
     actionHasFired_ = NO;
   }
   return self;
 }
 
 // NSButton/NSResponder Implementations ////////////////////////////////////////
 
-- (DraggableButtonResult)mouseUp:(NSEvent*)theEvent {
+- (DraggableButtonResult)mouseUpImpl:(NSEvent*)theEvent {
   durationMouseWasDown_ = [theEvent timestamp] - whenMouseDown_;
 
   if (actionHasFired_)
     return kDraggableButtonImplDidWork;
 
   if (!draggable_)
     return kDraggableButtonMixinCallSuper;
 
   // There are non-drag cases where a |-mouseUp:| may happen (e.g. mouse-down,
   // cmd-tab to another application, move mouse, mouse-up), so check.
   NSPoint viewLocal = [button_ convertPoint:[theEvent locationInWindow]
                                    fromView:[[button_ window] contentView]];
   if (NSPointInRect(viewLocal, [button_ bounds]))
     [button_ performClick:self];
 
   return kDraggableButtonImplDidWork;
 }
 
 // Mimic "begin a click" operation visually.  Do NOT follow through with normal
 // button event handling.
-- (DraggableButtonResult)mouseDown:(NSEvent*)theEvent {
+- (DraggableButtonResult)mouseDownImpl:(NSEvent*)theEvent {
   [[NSCursor arrowCursor] set];
 
   whenMouseDown_ = [theEvent timestamp];
   actionHasFired_ = NO;
 
   if (draggable_) {
     NSDate* date = [NSDate dateWithTimeIntervalSinceNow:kDragExpirationTimeout];
     if ([self dragShouldBeginFromMouseDown:theEvent
                             withExpiration:date]) {
       [button_ beginDrag:theEvent];
@@ skipping 181 matching lines @@
 
 - (void)endDrag {
   if ([button_ respondsToSelector:_cmd] &&
       [button_ endDrag] != kDraggableButtonImplUseBase) {
     return;
   }
   [button_ highlight:NO];
 }
 
 @end