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

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index 7a49780ff8065f3fb296035673671d299a5b0057..44f1bde7c784d98e9866d32613e3e94212d8471e 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -66,6 +66,8 @@
 using base::TimeDelta;
 using base::TimeTicks;
 using content::BrowserThread;
+using content::RenderWidgetHost;
+using content::RenderWidgetHostImpl;
 using content::RenderWidgetHostView;
 using ui::ViewProp;
 using WebKit::WebInputEvent;