Remove all the OS X 10.6 SDK forward declarations.

content/content_browser.gypi

 # 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.
 
 {
   'dependencies': [
     'browser/debugger/devtools_resources.gyp:devtools_resources',
     'browser/speech/proto/speech_proto.gyp:speech_proto',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
@@ skipping 895 matching lines @@
         '../third_party/mozilla/ComplexTextInputPanel.h',
         '../third_party/mozilla/ComplexTextInputPanel.mm',
         '../third_party/mozilla/NSPasteboard+Utils.h',
         '../third_party/mozilla/NSPasteboard+Utils.mm',
         '../third_party/mozilla/NSString+Utils.h',
         '../third_party/mozilla/NSString+Utils.mm',
         '../third_party/mozilla/NSURL+Utils.h',
         '../third_party/mozilla/NSURL+Utils.m',
       ],
       'dependencies': [
-        '../base/base.gyp:closure_blocks_leopard_compat',
         '../third_party/sudden_motion_sensor/sudden_motion_sensor.gyp:sudden_motion_sensor',
       ],
     }, { # OS!="mac"
       'dependencies': [
         '../sandbox/sandbox.gyp:sandbox',
       ],
     }],
     ['chromeos==1', {
       'dependencies': [
         '../build/linux/system.gyp:dbus-glib',
@@ skipping 69 matching lines @@
         ['exclude', '^browser/renderer_host/java/'],
       ],
     }],
     ['input_speech==0', {
       'sources/': [
         ['exclude', '^browser/speech/'],
       ],
     }],
   ],
 }