Plumb initiator out of Blink.

content/renderer/render_frame_proxy.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_frame_proxy.h"
 
 #include <stdint.h>
 #include <map>
 #include <utility>
 
@@ skipping 450 matching lines @@
   if (source_frame) {
     RenderFrameImpl* source_render_frame =
         RenderFrameImpl::FromWebFrame(source_frame);
     if (source_render_frame)
       params.source_routing_id = source_render_frame->GetRoutingID();
   }
 
   Send(new FrameHostMsg_RouteMessageEvent(routing_id_, params));
 }
 
-void RenderFrameProxy::navigate(const blink::WebURLRequest& request,
+void RenderFrameProxy::navigate(blink::WebLocalFrame* initiator_frame,
+                                const blink::WebURLRequest& request,
                                 bool should_replace_current_entry) {
   FrameHostMsg_OpenURL_Params params;
   params.url = request.url();
   params.uses_post = request.httpMethod().utf8() == "POST";
   params.resource_request_body = GetRequestBodyForWebURLRequest(request);
   params.extra_headers = GetWebURLRequestHeaders(request);
   params.referrer = Referrer(
       blink::WebStringToGURL(
           request.httpHeaderField(blink::WebString::fromUTF8("Referer"))),
       request.getReferrerPolicy());
@@ skipping 42 matching lines @@
                                     blink::WebLocalFrame* source) {
   int source_routing_id = RenderFrameImpl::FromWebFrame(source)->GetRoutingID();
   Send(new FrameHostMsg_AdvanceFocus(routing_id_, type, source_routing_id));
 }
 
 void RenderFrameProxy::frameFocused() {
   Send(new FrameHostMsg_FrameFocused(routing_id_));
 }
 
 }  // namespace