Android: Use a ResourceThrottle to intercept GET downloads.

chrome/chrome_browser.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 77 matching lines @@
         'browser/android/content_view_util.cc',
         'browser/android/content_view_util.h',
         'browser/android/crash_dump_manager.cc',
         'browser/android/crash_dump_manager.h',
         'browser/android/dev_tools_server.cc',
         'browser/android/dev_tools_server.h',
         'browser/android/google_location_settings_helper.h',
         'browser/android/infobar_stubs.cc',
         'browser/android/intent_helper.cc',
         'browser/android/intent_helper.h',
+        'browser/android/intercept_download_resource_throttle.cc',
+        'browser/android/intercept_download_resource_throttle.h',
         'browser/android/provider/blocking_ui_thread_async_request.cc',
         'browser/android/provider/blocking_ui_thread_async_request.h',
         'browser/android/provider/bookmark_model_observer_task.cc',
         'browser/android/provider/bookmark_model_observer_task.h',
         'browser/android/provider/chrome_browser_provider.cc',
         'browser/android/provider/chrome_browser_provider.h',
         'browser/android/provider/run_on_ui_thread_blocking.h',
         'browser/android/tab_android.cc',
         'browser/android/tab_android.h',
         'browser/app_controller_mac.h',
@@ skipping 2905 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }