Remove all the OS X 10.6 SDK forward declarations.

content/browser/renderer_host/render_widget_host_view_mac.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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #include <QuartzCore/QuartzCore.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
-#include "base/mac/closure_blocks_leopard_compat.h"
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_cftyperef.h"
 #import "base/mac/scoped_nsautorelease_pool.h"
 #import "base/memory/scoped_nsobject.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/sys_info.h"
 #include "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
@@ skipping 35 matching lines @@
 using content::RenderViewHostImpl;
 using content::RenderWidgetHost;
 using content::RenderWidgetHostImpl;
 using content::RenderWidgetHostView;
 using WebKit::WebInputEvent;
 using WebKit::WebInputEventFactory;
 using WebKit::WebMouseEvent;
 using WebKit::WebMouseWheelEvent;
 using WebKit::WebGestureEvent;
 
-// Declare things that are part of the 10.6 SDK.
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-enum {
-  NSEventTypeBeginGesture     = 19,
-  NSEventTypeEndGesture       = 20
-};
-
-enum {
-  NSEventMaskBeginGesture     = 1 << NSEventTypeBeginGesture,
-  NSEventMaskEndGesture       = 1 << NSEventTypeEndGesture,
-};
-
-typedef unsigned long long NSEventMask;
-
-@class NSTextInputContext;
-@interface NSResponder (AppKitDetails)
-- (NSTextInputContext*)inputContext;
-@end
-#endif  // 10.6
-
 // Declare things that are part of the 10.7 SDK.
 #if !defined(MAC_OS_X_VERSION_10_7) || \
     MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
 @interface NSEvent (LionAPI)
 + (id)addLocalMonitorForEventsMatchingMask:(NSEventMask)mask
                                    handler:(NSEvent* (^)(NSEvent*))block;
 + (void)removeMonitor:(id)eventMonitor;
 @end
 
 @interface NSScreen (LionAPI)
@@ skipping 2992 matching lines @@
   if (!string) return NO;
 
   // If the user is currently using an IME, confirm the IME input,
   // and then insert the text from the service, the same as TextEdit and Safari.
   [self confirmComposition];
   [self insertText:string];
   return YES;
 }
 
 @end