Start moving core pieces of Chrome multi-process code to src\content.

chrome/chrome_common.gypi

 # Copyright (c) 2010 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.
 
 {
   'target_defaults': {
     'variables': {
       'chrome_common_target': 0,
     },
     'target_conditions': [
@@ skipping 198 matching lines @@
         'chrome_strings',
         'common_constants',
         'common_net',
         'default_plugin/default_plugin.gyp:default_plugin',
         'theme_resources',
         '../app/app.gyp:app_base',
         '../app/app.gyp:app_resources',
         '../base/base.gyp:base',
         '../base/base.gyp:base_i18n',
         '../build/temp_gyp/googleurl.gyp:googleurl',
+        # Don't include now since it's empty and so will cause a linker error.
+        #'../content/content.gyp:content_common',
         '../ipc/ipc.gyp:ipc',
         '../net/net.gyp:net',
         '../printing/printing.gyp:printing',
         '../skia/skia.gyp:skia',
         '../third_party/bzip2/bzip2.gyp:bzip2',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/libxml/libxml.gyp:libxml',
         '../third_party/sqlite/sqlite.gyp:sqlite',
         '../third_party/zlib/zlib.gyp:zlib',
@@ skipping 410 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }