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

chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm

Index: chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm
diff --git a/chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm b/chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm
index 2b44bc2074baa988dfac34d3fa18318b4518d6fb..02d91c9e300aafed95b4bcdf7c6d8ebcf2ac85e0 100644
--- a/chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm
+++ b/chrome/browser/ui/cocoa/tab_contents/tab_contents_controller.mm
@@ -77,7 +77,7 @@ using content::WebContents;
   // The RWHV is ripped out of the view hierarchy on tab switches, so it never
   // formally resigns first responder status.  Handle this by explicitly sending
   // a Blur() message to the renderer, but only if the RWHV currently has focus.
-  RenderViewHost* rvh = [self webContents]->GetRenderViewHost();
+  content::RenderViewHost* rvh = [self webContents]->GetRenderViewHost();
   if (rvh && rvh->GetView() && rvh->GetView()->HasFocus())
     rvh->Blur();
 }