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

chrome/browser/favicon/favicon_tab_helper.cc

Index: chrome/browser/favicon/favicon_tab_helper.cc
diff --git a/chrome/browser/favicon/favicon_tab_helper.cc b/chrome/browser/favicon/favicon_tab_helper.cc
index 3bb104a4eac4f9e7714b8fd1d7a3747101fcaca5..b4c396a01f2bcb833ccafbf1ad49ef825dedcb4b 100644
--- a/chrome/browser/favicon/favicon_tab_helper.cc
+++ b/chrome/browser/favicon/favicon_tab_helper.cc
@@ -140,7 +140,7 @@ NavigationEntry* FaviconTabHelper::GetActiveEntry() {
 }
 
 void FaviconTabHelper::StartDownload(int id, const GURL& url, int image_size) {
-  RenderViewHost* host = web_contents()->GetRenderViewHost();
+  content::RenderViewHost* host = web_contents()->GetRenderViewHost();
   host->Send(new IconMsg_DownloadFavicon(
                  host->GetRoutingID(), id, url, image_size));
 }