Move MessagePort implementation from android_webview to content

content/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 
 source_set("browser") {
@@ skipping 165 matching lines @@
     "accessibility/browser_accessibility_manager_win.cc",
     "accessibility/browser_accessibility_manager_win.h",
     "accessibility/browser_accessibility_state_impl.cc",
     "accessibility/browser_accessibility_state_impl.h",
     "accessibility/browser_accessibility_state_impl_mac.mm",
     "accessibility/browser_accessibility_state_impl_win.cc",
     "accessibility/browser_accessibility_win.cc",
     "accessibility/browser_accessibility_win.h",
     "accessibility/one_shot_accessibility_tree_search.cc",
     "accessibility/one_shot_accessibility_tree_search.h",
+    "android/app_web_message_port_message_filter.cc",
+    "android/app_web_message_port_message_filter.h",
+    "android/app_web_message_port_service_impl.cc",
+    "android/app_web_message_port_service_impl.h",
     "android/background_sync_network_observer_android.cc",
     "android/background_sync_network_observer_android.h",
     "android/browser_jni_registrar.cc",
     "android/browser_jni_registrar.h",
     "android/browser_startup_controller.cc",
     "android/browser_startup_controller.h",
     "android/browser_surface_texture_manager.cc",
     "android/browser_surface_texture_manager.h",
     "android/child_process_launcher_android.cc",
     "android/child_process_launcher_android.h",
@@ skipping 1762 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }