Split ResourceContext into its own file, and make it compile on iOS

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/speech/proto/speech_proto.gyp:speech_proto',
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
@@ skipping 712 matching lines @@
     'browser/renderer_host/ui_events_helper.cc',
     'browser/renderer_host/ui_events_helper.h',
     'browser/renderer_host/web_input_event_aura.cc',
     'browser/renderer_host/web_input_event_aura.h',
     'browser/renderer_host/web_input_event_aurawin.cc',
     'browser/renderer_host/web_input_event_aurax11.cc',
     'browser/renderer_host/x509_user_cert_resource_handler.cc',
     'browser/renderer_host/x509_user_cert_resource_handler.h',
     'browser/resolve_proxy_msg_helper.cc',
     'browser/resolve_proxy_msg_helper.h',
+    'browser/resource_context.cc',
     'browser/resource_context_impl.cc',
     'browser/resource_context_impl.h',
     'browser/safe_util_win.cc',
     'browser/safe_util_win.h',
     'browser/site_instance_impl.cc',
     'browser/site_instance_impl.h',
     'browser/speech/audio_buffer.cc',
     'browser/speech/audio_buffer.h',
     'browser/speech/audio_encoder.cc',
     'browser/speech/audio_encoder.h',
@@ skipping 141 matching lines @@
         ['include', '^public/browser/web_ui_controller\\.cc'],
         ['include', '^browser/browser_context\\.cc$'],
         ['include', '^browser/browser_main_loop\\.cc$'],
         ['include', '^browser/browser_main_runner\\.cc$'],
         ['include', '^browser/browser_process_sub_thread\\.cc$'],
         ['include', '^browser/browser_thread_impl\\.cc$'],
         ['include', '^browser/browser_url_handler_impl\\.cc$'],
         ['include', '^browser/cert_store_impl\\.cc$'],
         ['include', '^browser/download/download_create_info\\.cc$'],
         ['include', '^browser/notification_service_impl\\.cc$'],
+        ['include', '^browser/resource_context\\.cc$'],
         ['include', '^browser/storage_partition_impl\\.cc$'],
         # Pull in all but one file from speech.
         ['include', '^browser/speech/'],
         ['exclude', '^browser/speech/input_tag_speech_dispatcher_host\\.cc$$'],
         ['include', '^browser/user_metrics\\.cc$'],
         ['include', '^browser/web_contents/navigation_entry_impl\\.cc$'],
       ],
     }, {  # OS!="ios"
       'dependencies': [
         'browser/debugger/devtools_resources.gyp:devtools_resources',
@@ skipping 195 matching lines @@
         ['exclude', '^browser/renderer_host/java/'],
       ],
     }],
     ['input_speech==0', {
       'sources/': [
         ['exclude', '^browser/speech/'],
       ],
     }],
   ],
 }