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 3f01401579b49cceab0bb88c50a6e1decd19feae..be53b7e97fd97944c2cf7b6c7e736d325ba157e9 100644
--- a/android_webview/BUILD.gn
+++ b/android_webview/BUILD.gn
@@ -335,9 +335,6 @@ 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",
@@ -434,7 +431,6 @@ 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",
@@ -460,8 +456,6 @@ 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",
@@ -568,8 +562,6 @@ 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",
@@ -605,7 +597,6 @@ 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",