Plumb initiator out of Blink.

third_party/WebKit/Source/core/frame/RemoteFrameClient.h

Index: third_party/WebKit/Source/core/frame/RemoteFrameClient.h
diff --git a/third_party/WebKit/Source/core/frame/RemoteFrameClient.h b/third_party/WebKit/Source/core/frame/RemoteFrameClient.h
index 06d6b7e603bc14cbbaadb2570f03aa63d2137c7f..3ebf82c11ba4bc7f83f5641b96af2bb2fa91ade8 100644
--- a/third_party/WebKit/Source/core/frame/RemoteFrameClient.h
+++ b/third_party/WebKit/Source/core/frame/RemoteFrameClient.h
@@ -12,6 +12,7 @@
 
 namespace blink {
 
+class Document;
 class IntRect;
 class LocalFrame;
 class MessageEvent;
@@ -22,7 +23,8 @@ class RemoteFrameClient : public FrameClient {
  public:
   ~RemoteFrameClient() override {}
 
-  virtual void navigate(const ResourceRequest&,
+  virtual void navigate(Document* originDocument,
+                        const ResourceRequest&,
                         bool shouldReplaceCurrentEntry) = 0;
   virtual void reload(FrameLoadType, ClientRedirectPolicy) = 0;
   virtual unsigned backForwardLength() = 0;