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

content/browser/tab_contents/web_contents_view_mac.h

Index: content/browser/tab_contents/web_contents_view_mac.h
diff --git a/content/browser/tab_contents/web_contents_view_mac.h b/content/browser/tab_contents/web_contents_view_mac.h
index 1d2a21eecffd71cfac8f66d54ffc83e7a31d84eb..5a4acc9c356e914a9945f427f265ba7c647a3019 100644
--- a/content/browser/tab_contents/web_contents_view_mac.h
+++ b/content/browser/tab_contents/web_contents_view_mac.h
@@ -66,12 +66,12 @@ class WebContentsViewMac : public content::WebContentsView {
 
   virtual void CreateView(const gfx::Size& initial_size) OVERRIDE;
   virtual content::RenderWidgetHostView* CreateViewForWidget(
-      RenderWidgetHost* render_widget_host) OVERRIDE;
+      content::RenderWidgetHost* render_widget_host) OVERRIDE;
   virtual gfx::NativeView GetNativeView() const OVERRIDE;
   virtual gfx::NativeView GetContentNativeView() const OVERRIDE;
   virtual gfx::NativeWindow GetTopLevelNativeWindow() const OVERRIDE;
   virtual void GetContainerBounds(gfx::Rect* out) const OVERRIDE;
-  virtual void RenderViewCreated(RenderViewHost* host) OVERRIDE;
+  virtual void RenderViewCreated(content::RenderViewHost* host) OVERRIDE;
   virtual void SetPageTitle(const string16& title) OVERRIDE;
   virtual void OnTabCrashed(base::TerminationStatus status,
                             int error_code) OVERRIDE;