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

chrome/browser/ui/webui/ntp/new_tab_ui.cc

Index: chrome/browser/ui/webui/ntp/new_tab_ui.cc
diff --git a/chrome/browser/ui/webui/ntp/new_tab_ui.cc b/chrome/browser/ui/webui/ntp/new_tab_ui.cc
index 5b77f8e988d670b7374a4acd00391f5c2c9f187e..bb34ee181d8f03a5c4741250149775ee950e0010 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_ui.cc
+++ b/chrome/browser/ui/webui/ntp/new_tab_ui.cc
@@ -60,6 +60,7 @@
 #endif
 
 using content::BrowserThread;
+using content::RenderViewHost;
 using content::UserMetricsAction;
 using content::WebContents;
 using content::WebUIController;
@@ -196,7 +197,7 @@ void NewTabUI::StartTimingPaint(RenderViewHost* render_view_host) {
   start_ = base::TimeTicks::Now();
   last_paint_ = start_;
   registrar_.Add(this, content::NOTIFICATION_RENDER_WIDGET_HOST_DID_PAINT,
-      content::Source<RenderWidgetHost>(render_view_host));
+                 content::Source<content::RenderWidgetHost>(render_view_host));
   timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(kTimeoutMs), this,
                &NewTabUI::PaintTimeout);