Remove all the OS X 10.6 SDK forward declarations.

ui/gfx/video_decode_acceleration_support_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 "ui/gfx/video_decode_acceleration_support_mac.h"
 
 #include <dlfcn.h>
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #import "base/mac/foundation_util.h"
 #include "base/location.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/native_library.h"
 
 using base::mac::CFToNSCast;
 using base::mac::NSToCFCast;
 
 const CFStringRef kVDADecoderConfiguration_Width = CFSTR("width");
 const CFStringRef kVDADecoderConfiguration_Height = CFSTR("height");
 const CFStringRef kVDADecoderConfiguration_SourceFormat = CFSTR("format");
 const CFStringRef kVDADecoderConfiguration_avcCData = CFSTR("avcC");
 const CFStringRef kCVPixelBufferIOSurfacePropertiesKey =
     CFSTR("IOSurfaceProperties");
 
-#if !defined(MAC_OS_X_VERSION_10_6) || \
-    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_6
-enum {
-  kVDADecoderNoErr = 0,
-  kVDADecoderHardwareNotSupportedErr = -12470,
-  kVDADecoderFormatNotSupportedErr = -12471,
-  kVDADecoderFlush_EmitFrames = 1 << 0,
-};
-
-typedef void (*VDADecoderOutputCallback)(
-    void* decompressionOutputRefCon,
-    CFDictionaryRef frameInfo,
-    OSStatus status,
-    uint32_t infoFlags,
-    CVImageBufferRef imageBuffer);
-#endif  // MAC_OS_X_VERSION_10_6
-
 namespace {
 
 // These are 10.6.3 APIs that we look up at run time.
 typedef OSStatus (*VDADecoderCreateFunc)(
     CFDictionaryRef decoderConfiguration,
     CFDictionaryRef destinationImageBufferAttributes,
     VDADecoderOutputCallback* outputCallback,
     void* decoderOutputCallbackRefcon,
     VDADecoder* decoderOut);
 
@@ skipping 177 matching lines @@
                                                   OSStatus status,
                                                   int frame_id) {
   frame_ready_callbacks_[frame_id].Run(image_buffer, status);
   // Match the retain in OnFrameReadyCallback.
   if (image_buffer)
     CFRelease(image_buffer);
   frame_ready_callbacks_.erase(frame_id);
 }
 
 }  // namespace