Remove all the OS X 10.6 SDK forward declarations.

chrome/browser/ui/cocoa/base_bubble_controller.mm

 // Copyright (c) 2012 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/base_bubble_controller.h"
 
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
-#include "base/mac/closure_blocks_leopard_compat.h"
 #include "base/mac/mac_util.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/string_util.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/info_bubble_view.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_strip_model_observer_bridge.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 @interface BaseBubbleController (Private)
 - (void)updateOriginFromAnchor;
 - (void)activateTabWithContents:(TabContents*)newContents
                previousContents:(TabContents*)oldContents
                         atIndex:(NSInteger)index
                     userGesture:(bool)wasUserGesture;
 @end
 
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-typedef unsigned long long NSEventMask;
-
-@interface NSEvent (SnowLeopardDeclarations)
-+ (id)addLocalMonitorForEventsMatchingMask:(NSEventMask)mask
-                                   handler:(NSEvent* (^)(NSEvent*))block;
-+ (void)removeMonitor:(id)eventMonitor;
-@end
-
-@interface NSOperationQueue (SnowLeopardDeclarations)
-+ (id)mainQueue;
-@end
-
-@interface NSNotificationCenter (SnowLeopardDeclarations)
-- (id)addObserverForName:(NSString*)name
-                  object:(id)obj
-                   queue:(NSOperationQueue*)queue
-              usingBlock:(void (^)(NSNotification*))block;
-@end
-#endif  // MAC_OS_X_VERSION_10_6
-
 @implementation BaseBubbleController
 
 @synthesize parentWindow = parentWindow_;
 @synthesize anchorPoint = anchor_;
 @synthesize bubble = bubble_;
 
 - (id)initWithWindowNibPath:(NSString*)nibPath
                parentWindow:(NSWindow*)parentWindow
                  anchoredAt:(NSPoint)anchoredAt {
   nibPath = [base::mac::FrameworkBundle() pathForResource:nibPath
@@ skipping 234 matching lines @@
 
 - (void)activateTabWithContents:(TabContents*)newContents
                previousContents:(TabContents*)oldContents
                         atIndex:(NSInteger)index
                     userGesture:(bool)wasUserGesture {
   // The user switched tabs; close.
   [self close];
 }
 
 @end  // BaseBubbleController