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

chrome/browser/ui/webui/constrained_html_ui.h

Index: chrome/browser/ui/webui/constrained_html_ui.h
diff --git a/chrome/browser/ui/webui/constrained_html_ui.h b/chrome/browser/ui/webui/constrained_html_ui.h
index c696ed0b8f0a4a1f9ca75d9a1385d00b0ea26823..dc1efd2b861f93d017319e0e89b87023f868a584 100644
--- a/chrome/browser/ui/webui/constrained_html_ui.h
+++ b/chrome/browser/ui/webui/constrained_html_ui.h
@@ -13,13 +13,16 @@ class ConstrainedWindow;
 class HtmlDialogTabContentsDelegate;
 class HtmlDialogUIDelegate;
 class Profile;
-class RenderViewHost;
 class TabContentsWrapper;
 
 namespace base {
 template<class T> class PropertyAccessor;
 }
 
+namespace content {
+class RenderViewHost;
+}
+
 class ConstrainedHtmlUIDelegate {
  public:
   virtual const HtmlDialogUIDelegate* GetHtmlDialogUIDelegate() const = 0;
@@ -58,7 +61,8 @@ class ConstrainedHtmlUI : public content::WebUIController {
   virtual ~ConstrainedHtmlUI();
 
   // WebUIController implementation:
-  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
+  virtual void RenderViewCreated(
+      content::RenderViewHost* render_view_host) OVERRIDE;
 
   // Create a constrained HTML dialog. The actual object that gets created
   // is a ConstrainedHtmlUIDelegate, which later triggers construction of a