Transfer user agent override info between browser and renderer

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index d2ed3d5824ccf560e1b6d4b6186f9a0d2799ad45..c91cdee3ba292b71c0d5dc9eb4801db097f685f7 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -644,6 +644,8 @@ class RenderViewImpl : public RenderWidget,
       WebKit::WebFrame* source,
       WebKit::WebSecurityOrigin targetOrigin,
       WebKit::WebDOMMessageEvent event) OVERRIDE;
+  virtual WebKit::WebString userAgentOverride(
+      const WebKit::WebURL& url) OVERRIDE;
 
   // WebKit::WebPageSerializerClient implementation ----------------------------
 
@@ -1127,6 +1129,9 @@ class RenderViewImpl : public RenderWidget,
   // should be drawn.
   gfx::Size disable_scrollbars_size_limit_;
 
+  // Whether or not the override is being used.
+  bool is_overriding_user_agent_;
+
   // Loading state -------------------------------------------------------------
 
   // True if the top level frame is currently being loaded.