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

content/browser/webui/web_ui_impl.h

Index: content/browser/webui/web_ui_impl.h
diff --git a/content/browser/webui/web_ui_impl.h b/content/browser/webui/web_ui_impl.h
index eef3948f92791e7dfaf25a3bc15273a364f4c604..28b73606725f48ab1ec5c44d1a7fbc88e08622e5 100644
--- a/content/browser/webui/web_ui_impl.h
+++ b/content/browser/webui/web_ui_impl.h
@@ -12,7 +12,9 @@
 #include "content/public/browser/web_ui.h"
 #include "ipc/ipc_channel.h"
 
+namespace content {
 class RenderViewHost;
+}
 
 class CONTENT_EXPORT WebUIImpl : public content::WebUI,
                                  public IPC::Channel::Listener {
@@ -23,7 +25,7 @@ class CONTENT_EXPORT WebUIImpl : public content::WebUI,
   // Called by TabContents when the RenderView is first created. This is *not*
   // called for every page load because in some cases RenderViewHostManager will
   // reuse RenderView instances.
-  void RenderViewCreated(RenderViewHost* render_view_host);
+  void RenderViewCreated(content::RenderViewHost* render_view_host);
 
   // WebUI implementation:
   virtual content::WebContents* GetWebContents() const OVERRIDE;