First pass at content shell for the Mac. Doesn't work yet.

chrome/chrome_dll.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.
 {
   'conditions': [
     ['OS=="mac" or OS=="win"', {
       'targets': [
         {
           'target_name': 'chrome_dll',
           'type': 'none',
@@ skipping 186 matching lines @@
                 # See tools/build/mac/copy_framework_unversioned for
                 # information on LD_DYLIB_INSTALL_NAME.
                 'LD_DYLIB_INSTALL_NAME':
                     '$(DYLIB_INSTALL_NAME_BASE:standardizepath)/$(WRAPPER_NAME)/$(PRODUCT_NAME)',
 
                 'INFOPLIST_FILE': 'app/framework-Info.plist',
 
                 # Define the order of symbols within the framework.  This
                 # sets -order_file.
                 'ORDER_FILE': 'app/framework.order',
+
+                # Hide symbols that shouldn't be exported.
+                'UNEXPORTED_SYMBOLS_FILE': 'app/unexported_symbols.exp',
               },
               'sources': [
                 'app/chrome_command_ids.h',
                 'app/chrome_dll_resource.h',
                 'app/chrome_main.cc',
                 'app/chrome_main_delegate.cc',
                 'app/chrome_main_delegate.h',
                 'app/chrome_main_app_mode_mac.mm',
                 'app/chrome_main_mac.mm',
                 'app/chrome_main_mac.h',
@@ skipping 284 matching lines @@
                 }],  # mac_breakpad_compiled_in
                 ['mac_keystone==1', {
                   'mac_bundle_resources': [
                     'browser/mac/keystone_promote_preflight.sh',
                     'browser/mac/keystone_promote_postflight.sh',
                   ],
                   'postbuilds': [
                     {
                       'postbuild_name': 'Copy KeystoneRegistration.framework',
                       'action': [
-                        'tools/build/mac/copy_framework_unversioned',
+                        '../build/mac/copy_framework_unversioned',
                         '../third_party/googlemac/Releases/Keystone/KeystoneRegistration.framework',
                         '${BUILT_PRODUCTS_DIR}/${CONTENTS_FOLDER_PATH}/Frameworks',
                       ],
                     },
                     {
                       'postbuild_name': 'Symlink Frameworks',
                       'action': [
                         'ln',
                         '-fhs',
                         'Versions/Current/Frameworks',
                         '${BUILT_PRODUCTS_DIR}/${WRAPPER_NAME}/Frameworks'
                       ],
                     },
                   ],
                 }],  # mac_keystone
                 ['internal_pdf', {
                   'dependencies': [
                     '../pdf/pdf.gyp:pdf',
                   ],
                 }],
               ],  # conditions
             }],  # OS=="mac"
           ],  # conditions
         },  # target chrome_dll
       ],  # targets
     }],  # OS=="mac" or OS=="win"
   ],
 }