Remove RenderViewImpl::device_orientation_dispatcher_ (not used).

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 2ff9098056429d4fd0459a2dfc2c43f4778e9d9a..16c522b571a8ad75744c159c0d967c7f7045589b 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -127,7 +127,6 @@ class WebURLResponseExtraDataImpl;
 
 namespace content {
 class BrowserPluginManager;
-class DeviceOrientationDispatcher;
 class DevToolsAgent;
 class DocumentState;
 class ExternalPopupMenu;
@@ -1066,9 +1065,6 @@ class CONTENT_EXPORT RenderViewImpl
   // initialized.
   SpeechRecognitionDispatcher* speech_recognition_dispatcher_;
 
-  // Device orientation dispatcher attached to this view; lazily initialized.
-  DeviceOrientationDispatcher* device_orientation_dispatcher_;
-
   // MediaStream dispatcher attached to this view; lazily initialized.
   MediaStreamDispatcher* media_stream_dispatcher_;