Move MessagePort implementation from android_webview to content

android_webview/BUILD.gn

Index: android_webview/BUILD.gn
diff --git a/android_webview/BUILD.gn b/android_webview/BUILD.gn
index cb4cc43832f406a5ab8ad4c4dff854156badc7de..afd6d3bf947d15bf63965e096e6bf2ef721eabe3 100644
--- a/android_webview/BUILD.gn
+++ b/android_webview/BUILD.gn
@@ -334,9 +334,6 @@ source_set("common") {
     "browser/aw_locale_manager.h",
     "browser/aw_login_delegate.cc",
     "browser/aw_login_delegate.h",
-    "browser/aw_message_port_message_filter.cc",
-    "browser/aw_message_port_message_filter.h",
-    "browser/aw_message_port_service.h",
     "browser/aw_metrics_service_client.cc",
     "browser/aw_metrics_service_client.h",
     "browser/aw_permission_manager.cc",
@@ -431,7 +428,6 @@ source_set("common") {
     "common/aw_hit_test_data.h",
     "common/aw_media_client_android.cc",
     "common/aw_media_client_android.h",
-    "common/aw_message_port_messages.h",
     "common/aw_resource.h",
     "common/aw_switches.cc",
     "common/aw_switches.h",
@@ -457,8 +453,6 @@ source_set("common") {
     "renderer/aw_content_settings_client.h",
     "renderer/aw_key_systems.cc",
     "renderer/aw_key_systems.h",
-    "renderer/aw_message_port_client.cc",
-    "renderer/aw_message_port_client.h",
     "renderer/aw_print_web_view_helper_delegate.cc",
     "renderer/aw_print_web_view_helper_delegate.h",
     "renderer/aw_render_frame_ext.cc",
@@ -565,8 +559,6 @@ android_library("android_webview_java") {
     "java/src/org/chromium/android_webview/AwGLFunctor.java",
     "java/src/org/chromium/android_webview/AwHttpAuthHandler.java",
     "java/src/org/chromium/android_webview/AwLayoutSizer.java",
-    "java/src/org/chromium/android_webview/AwMessagePort.java",
-    "java/src/org/chromium/android_webview/AwMessagePortService.java",
     "java/src/org/chromium/android_webview/AwMetricsServiceClient.java",
     "java/src/org/chromium/android_webview/AwNetworkChangeNotifierRegistrationPolicy.java",
     "java/src/org/chromium/android_webview/AwPdfExporter.java",
@@ -602,7 +594,6 @@ android_library("android_webview_java") {
     "java/src/org/chromium/android_webview/NullAwViewMethods.java",
     "java/src/org/chromium/android_webview/OverScrollGlow.java",
     "java/src/org/chromium/android_webview/PlatformServiceBridge.java",
-    "java/src/org/chromium/android_webview/PostMessageSender.java",
     "java/src/org/chromium/android_webview/PopupTouchHandleDrawable.java",
     "java/src/org/chromium/android_webview/ResourcesContextWrapperFactory.java",
     "java/src/org/chromium/android_webview/ScrollAccessibilityHelper.java",