Revert of Properly route screen orientation IPC messages.

content/browser/screen_orientation/screen_orientation_dispatcher_host.cc

Index: content/browser/screen_orientation/screen_orientation_dispatcher_host.cc
diff --git a/content/browser/screen_orientation/screen_orientation_dispatcher_host.cc b/content/browser/screen_orientation/screen_orientation_dispatcher_host.cc
index a27890e71e99c46e987fc47428bbf3dc1551d97f..3bb494d93f900109ee2ed43fb84bcbf79c943951 100644
--- a/content/browser/screen_orientation/screen_orientation_dispatcher_host.cc
+++ b/content/browser/screen_orientation/screen_orientation_dispatcher_host.cc
@@ -6,14 +6,11 @@
 
 #include "content/browser/screen_orientation/screen_orientation_provider.h"
 #include "content/common/screen_orientation_messages.h"
-#include "content/public/browser/render_frame_host.h"
-#include "content/public/browser/web_contents.h"
 
 namespace content {
 
-ScreenOrientationDispatcherHost::ScreenOrientationDispatcherHost(
-    WebContents* web_contents)
-    : WebContentsObserver(web_contents) {
+ScreenOrientationDispatcherHost::ScreenOrientationDispatcherHost()
+  : BrowserMessageFilter(ScreenOrientationMsgStart) {
   if (!provider_.get())
     provider_.reset(CreateProvider());
 }
@@ -22,13 +19,10 @@
 }
 
 bool ScreenOrientationDispatcherHost::OnMessageReceived(
-    const IPC::Message& message,
-    RenderFrameHost* render_frame_host) {
+    const IPC::Message& message) {
   bool handled = true;
 
-  int routing_id = message.routing_id();
-  IPC_BEGIN_MESSAGE_MAP_WITH_PARAM(ScreenOrientationDispatcherHost, message,
-                                   &routing_id)
+  IPC_BEGIN_MESSAGE_MAP(ScreenOrientationDispatcherHost, message)
     IPC_MESSAGE_HANDLER(ScreenOrientationHostMsg_LockRequest, OnLockRequest)
     IPC_MESSAGE_HANDLER(ScreenOrientationHostMsg_Unlock, OnUnlockRequest)
     IPC_MESSAGE_UNHANDLED(handled = false)
@@ -48,28 +42,24 @@
 }
 
 void ScreenOrientationDispatcherHost::OnLockRequest(
-    int* routing_id,
     blink::WebScreenOrientationLockType orientation,
     int request_id) {
   if (!provider_) {
     Send(new ScreenOrientationMsg_LockError(
-        *routing_id,
-        request_id,
-        blink::WebLockOrientationCallback::ErrorTypeNotAvailable));
+         request_id,
+         blink::WebLockOrientationCallback::ErrorTypeNotAvailable));
     return;
   }
 
   // TODO(mlamouri): pass real values.
   Send(new ScreenOrientationMsg_LockSuccess(
-      *routing_id,
-      request_id,
-      0,
-      blink::WebScreenOrientationPortraitPrimary));
+       request_id,
+       0,
+       blink::WebScreenOrientationPortraitPrimary));
   provider_->LockOrientation(orientation);
 }
 
-void ScreenOrientationDispatcherHost::OnUnlockRequest(
-    int* routing_id) {
+void ScreenOrientationDispatcherHost::OnUnlockRequest() {
   if (!provider_.get())
     return;