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

chrome/browser/prerender/prerender_manager_unittest.cc

Index: chrome/browser/prerender/prerender_manager_unittest.cc
diff --git a/chrome/browser/prerender/prerender_manager_unittest.cc b/chrome/browser/prerender/prerender_manager_unittest.cc
index 29e19ec69c5f64bd1e6c766e32f4a40a64601c9e..8eb1aec9b60a601a3f693dc900f9f1f9b6659ea1 100644
--- a/chrome/browser/prerender/prerender_manager_unittest.cc
+++ b/chrome/browser/prerender/prerender_manager_unittest.cc
@@ -42,7 +42,7 @@ class DummyPrerenderContents : public PrerenderContents {
   }
 
   virtual void StartPrerendering(
-      const RenderViewHost* source_render_view_host,
+      const content::RenderViewHost* source_render_view_host,
       content::SessionStorageNamespace* session_storage_namespace) OVERRIDE {
     has_started_ = true;
   }