Remove dead WebCompositorInputHandler related code

android_webview/browser/renderer_host/aw_render_view_host_ext.cc

Index: android_webview/browser/renderer_host/aw_render_view_host_ext.cc
diff --git a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
index 7472599e66ce2f6217beca40b022dfde8b042327..65641d7b334e3f7fd9f41a3eb7b9ad2d7bd45e86 100644
--- a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
+++ b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
@@ -18,7 +18,6 @@
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/frame_navigate_params.h"
-#include "third_party/WebKit/Source/WebKit/chromium/public/WebCompositorInputHandler.h"
 
 namespace android_webview {
 
@@ -112,8 +111,6 @@ bool AwRenderViewHostExt::OnMessageReceived(const IPC::Message& message) {
                         OnDocumentHasImagesResponse)
     IPC_MESSAGE_HANDLER(AwViewHostMsg_UpdateHitTestData,
                         OnUpdateHitTestData)
-    IPC_MESSAGE_HANDLER(AwViewHostMsg_DidActivateAcceleratedCompositing,
-                        OnDidActivateAcceleratedCompositing)
     IPC_MESSAGE_HANDLER(AwViewHostMsg_PageScaleFactorChanged,
                         OnPageScaleFactorChanged)
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -142,27 +139,6 @@ void AwRenderViewHostExt::OnUpdateHitTestData(
   has_new_hit_test_data_ = true;
 }
 
-void AwRenderViewHostExt::OnDidActivateAcceleratedCompositing(
-    int input_handler_id) {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kNoMergeUIAndRendererCompositorThreads)) {
-    return;
-  }
-
-  // This call is only meaningful and thread-safe when the UI and renderer
-  // compositor share the same thread.  Any other case will likely yield
-  // terrible, terrible damage.
-  WebKit::WebCompositorInputHandler* input_handler =
-      WebKit::WebCompositorInputHandler::fromIdentifier(input_handler_id);
-  if (!input_handler)
-    return;
-
-  content::ContentViewCore* content_view_core
-      = content::ContentViewCore::FromWebContents(web_contents());
-  if (content_view_core)
-    content_view_core->SetInputHandler(input_handler);
-}
-
 void AwRenderViewHostExt::OnPageScaleFactorChanged(float page_scale_factor) {
   client_->OnPageScaleFactorChanged(page_scale_factor);
 }