[Android WebView] Only send extra headers for the main page

android_webview/android_webview.gyp

 # Copyright 2009 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.
 {
   'variables': {
     'chromium_code': 1,
   },
   'conditions': [
     ['android_webview_build==0', {
       'includes': [
@@ skipping 126 matching lines @@
         'browser/aw_login_delegate.cc',
         'browser/aw_login_delegate.h',
         'browser/aw_pref_store.cc',
         'browser/aw_pref_store.h',
         'browser/aw_quota_manager_bridge.cc',
         'browser/aw_quota_manager_bridge.h',
         'browser/aw_quota_permission_context.cc',
         'browser/aw_quota_permission_context.h',
         'browser/aw_request_interceptor.cc',
         'browser/aw_request_interceptor.h',
+        'browser/aw_resource_context.cc',
+        'browser/aw_resource_context.h',
         'browser/aw_result_codes.h',
         'browser/aw_web_preferences_populater.cc',
         'browser/aw_web_preferences_populater.h',
         'browser/browser_view_renderer.h',
         'browser/find_helper.cc',
         'browser/find_helper.h',
         'browser/gpu_memory_buffer_factory_impl.cc',
         'browser/gpu_memory_buffer_factory_impl.h',
         'browser/icon_helper.cc',
         'browser/icon_helper.h',
@@ skipping 70 matching lines @@
         '../content/content.gyp:content_java',
         '../ui/android/ui_android.gyp:ui_java',
       ],
       'variables': {
         'java_in_dir': '../android_webview/java',
       },
       'includes': [ '../build/java.gypi' ],
     },
   ],
 }