Properly route screen orientation IPC messages.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 9f6ead2c45afab29758b3f8eebdc4f99dd38a2de..b76a165fd9077689a1cc15ed9c035d3a99c775bc 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -45,6 +45,7 @@
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
+#include "content/browser/screen_orientation/screen_orientation_dispatcher_host.h"
 #include "content/browser/site_instance_impl.h"
 #include "content/browser/web_contents/web_contents_view_guest.h"
 #include "content/browser/webui/generic_handler.h"
@@ -1097,6 +1098,9 @@ void WebContentsImpl::Init(const WebContents::CreateParams& params) {
   geolocation_dispatcher_host_.reset(new GeolocationDispatcherHost(this));
   midi_dispatcher_host_.reset(new MidiDispatcherHost(this));
 
+  screen_orientation_dispatcher_host_.reset(
+      new ScreenOrientationDispatcherHost(this));
+
 #if defined(OS_ANDROID)
   date_time_chooser_.reset(new DateTimeChooserAndroid());
 #endif