[Android] Add proxy for Java-based WebContentsObservers

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': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../device/vibration/vibration.gyp:device_vibration',
     '../device/vibration/vibration.gyp:device_vibration_mojo_bindings',
@@ skipping 351 matching lines @@
       'browser/android/overscroll_glow.cc',
       'browser/android/overscroll_glow.h',
       'browser/android/overscroll_refresh.cc',
       'browser/android/overscroll_refresh.h',
       'browser/android/popup_touch_handle_drawable.cc',
       'browser/android/popup_touch_handle_drawable.h',
       'browser/android/tracing_controller_android.cc',
       'browser/android/tracing_controller_android.h',
       'browser/android/url_request_content_job.cc',
       'browser/android/url_request_content_job.h',
-      'browser/android/web_contents_observer_android.cc',
-      'browser/android/web_contents_observer_android.h',
+      'browser/android/web_contents_observer_proxy.cc',
+      'browser/android/web_contents_observer_proxy.h',
       'browser/appcache/appcache.cc',
       'browser/appcache/appcache.h',
       'browser/appcache/appcache_backend_impl.cc',
       'browser/appcache/appcache_backend_impl.h',
       'browser/appcache/appcache_database.cc',
       'browser/appcache/appcache_database.h',
       'browser/appcache/appcache_disk_cache.cc',
       'browser/appcache/appcache_disk_cache.h',
       'browser/appcache/appcache_dispatcher_host.cc',
       'browser/appcache/appcache_dispatcher_host.h',
@@ skipping 1590 matching lines @@
         'browser/media/media_web_contents_observer.h',
       ],
     }],
     ['OS == "linux" and use_openssl==1', {
       'dependencies': [
         '../third_party/boringssl/boringssl.gyp:boringssl',
       ],
     }],
   ],
 }