Cleanup some forward declared structs that are not being used.

chrome/browser/renderer_host/render_view_host.h

Index: chrome/browser/renderer_host/render_view_host.h
===================================================================
--- chrome/browser/renderer_host/render_view_host.h	(revision 9264)
+++ chrome/browser/renderer_host/render_view_host.h	(working copy)
@@ -30,8 +30,6 @@
 struct ContextMenuParams;
 struct ViewHostMsg_DidPrintPage_Params;
 struct ViewMsg_Navigate_Params;
-struct ViewMsg_Print_Params;
-struct ViewMsg_PrintPages_Params;
 struct WebDropData;
 struct WebPreferences;
 
@@ -379,7 +377,7 @@
   void UnloadListenerHasFired() { has_unload_listener_ = false; }
 
 #ifdef CHROME_PERSONALIZATION
-  // Tells the RenderView to raise an personalization event with the given name 
+  // Tells the RenderView to raise an personalization event with the given name
   // and argument.
   void RaisePersonalizationEvent(std::string event_name, std::string event_arg);