Plumb initiator out of Blink.

third_party/WebKit/public/web/WebRemoteFrameClient.h

Index: third_party/WebKit/public/web/WebRemoteFrameClient.h
diff --git a/third_party/WebKit/public/web/WebRemoteFrameClient.h b/third_party/WebKit/public/web/WebRemoteFrameClient.h
index 3629263debb54036ae891a1aababd6f94c54d221..67617570d4feb6bc8e693093e589e3e665576924 100644
--- a/third_party/WebKit/public/web/WebRemoteFrameClient.h
+++ b/third_party/WebKit/public/web/WebRemoteFrameClient.h
@@ -31,7 +31,8 @@ class WebRemoteFrameClient {
                                   WebDOMMessageEvent) {}
 
   // A remote frame was asked to start a navigation.
-  virtual void navigate(const WebURLRequest& request,
+  virtual void navigate(WebLocalFrame* initiatorFrame,
+                        const WebURLRequest& request,
                         bool shouldReplaceCurrentEntry) {}
   virtual void reload(WebFrameLoadType, WebClientRedirectPolicy) {}