Move Render(View|Widget)Host and associated classes to content namespace.

content/browser/renderer_host/resource_dispatcher_host.cc

Index: content/browser/renderer_host/resource_dispatcher_host.cc
diff --git a/content/browser/renderer_host/resource_dispatcher_host.cc b/content/browser/renderer_host/resource_dispatcher_host.cc
index ef9e225487f968feccbfee012e6aecc444760374..90ca020397c5403e58e0626d9fe6fabaade1d5e2 100644
--- a/content/browser/renderer_host/resource_dispatcher_host.cc
+++ b/content/browser/renderer_host/resource_dispatcher_host.cc
@@ -89,6 +89,7 @@ using base::TimeDelta;
 using base::TimeTicks;
 using content::BrowserThread;
 using content::GlobalRequestID;
+using content::RenderViewHostImpl;
 using content::ResourceContext;
 using content::ResourceResponse;
 using content::ResourceThrottle;