sky/shell should link with sky/engine

sky/engine/core/frame/FrameHost.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
 // FrameHost currently corresponds to the Page object in core/page
 // however the concept of a Page is moving up out of Blink.
 // In an out-of-process iframe world, a single Page may have
 // multiple frames in different process, thus Page becomes a
 // browser-level concept and Blink core/ only knows about its LocalFrame (and FrameHost).
 // Separating Page from the rest of core/ through this indirection
 // allows us to slowly refactor Page without breaking the rest of core.
 class FrameHost final {
     WTF_MAKE_NONCOPYABLE(FrameHost); WTF_MAKE_FAST_ALLOCATED;
 public:
-    static PassOwnPtr<FrameHost> create(Page&, ServiceProvider&);
+    static PassOwnPtr<FrameHost> create(Page&, ServiceProvider*);
     ~FrameHost();
 
     // Careful: This function will eventually be removed.
     Page& page() const { return *m_page; }
     Settings& settings() const;
 
-    ServiceProvider& services() const { return m_services; }
+    ServiceProvider* services() const { return m_services; }
 
     // Corresponds to pixel density of the device where this Page is
     // being displayed. In multi-monitor setups this can vary between pages.
     // This value does not account for Page zoom, use LocalFrame::devicePixelRatio instead.
     float deviceScaleFactor() const;
 
 private:
-    FrameHost(Page&, ServiceProvider&);
+    FrameHost(Page&, ServiceProvider*);
 
     Page* m_page;
-    ServiceProvider& m_services;
+    ServiceProvider* m_services;
 };
 
 }
 
 #endif  // SKY_ENGINE_CORE_FRAME_FRAMEHOST_H_