Create a new RenderFrameHost per child frame when --site-per-process is enabled.

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index b6940f96e9152c8cf35c522d10899786097cf528..19666f6f5c2594724116af1b3ccd131a1b1e03ed 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -54,8 +54,8 @@ class CONTENT_EXPORT RenderFrameImpl
       WebKit::WebApplicationCacheHostClient* client);
   virtual WebKit::WebCookieJar* cookieJar(WebKit::WebFrame* frame);
   virtual void didAccessInitialDocument(WebKit::WebFrame* frame);
-  virtual void didCreateFrame(WebKit::WebFrame* parent,
-                              WebKit::WebFrame* child);
+  virtual WebKit::WebFrame* createChildFrame(WebKit::WebFrame* parent,
+                                             const WebKit::WebString& name);
   virtual void didDisownOpener(WebKit::WebFrame* frame);
   virtual void frameDetached(WebKit::WebFrame* frame);
   virtual void willClose(WebKit::WebFrame* frame);