move favicon download code from chrome/ into content/

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 ee266e403e4846c0bc08edcef439860f9a7fe170..0ed5af240701c887a6228f8243f16f271cd600de 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -143,6 +143,7 @@ class DevToolsAgent;
 class DocumentState;
 class DomAutomationController;
 class ExternalPopupMenu;
+class FaviconHelper;
 class GeolocationDispatcher;
 class InputTagSpeechDispatcher;
 class JavaBridgeDispatcher;
@@ -1401,6 +1402,9 @@ class CONTENT_EXPORT RenderViewImpl
   // Mouse Lock dispatcher attached to this view.
   MouseLockDispatcher* mouse_lock_dispatcher_;
 
+  // Helper class to handle favicon changes.
+  FaviconHelper* favicon_helper_;
+
 #if defined(OS_ANDROID)
   // Android Specific ---------------------------------------------------------