Make SecurityContext available in RemoteFrames.

Source/core/frame/Frame.h

Index: Source/core/frame/Frame.h
diff --git a/Source/core/frame/Frame.h b/Source/core/frame/Frame.h
index cb43d4c2ab743f76e23d0fbee7d6adcb713191a3..8c72c8b18225e980ecaa909b9cce10f2bd158000 100644
--- a/Source/core/frame/Frame.h
+++ b/Source/core/frame/Frame.h
@@ -45,6 +45,7 @@ class DOMWindow;
 class KURL;
 class Page;
 class RenderPart;
+class SecurityContext;
 class Settings;
 class WebLayer;
 
@@ -83,6 +84,8 @@ public:
     FrameTree& tree() const;
     ChromeClient& chromeClient() const;
 
+    virtual SecurityContext* securityContext() const = 0;
+
     RenderPart* ownerRenderer() const; // Renderer for the element that contains this frame.
 
     // FIXME: These should move to RemoteFrame when that is instantiated.