Break dependency of native_viewport_service on mojo::shell::Context

mojo/services/native_viewport/native_viewport.h

Index: mojo/services/native_viewport/native_viewport.h
diff --git a/mojo/services/native_viewport/native_viewport.h b/mojo/services/native_viewport/native_viewport.h
index d33f33ff889f30c198ffec659a7d3f17b3e7682b..ae2b0610f1a62e24d2cbe5e6c6f7bb8928e7d45c 100644
--- a/mojo/services/native_viewport/native_viewport.h
+++ b/mojo/services/native_viewport/native_viewport.h
@@ -19,10 +19,6 @@ class Event;
 }
 
 namespace mojo {
-namespace shell {
-class Context;
-}
-
 namespace services {
 
 class NativeViewportDelegate {
@@ -52,9 +48,7 @@ class NativeViewport {
   virtual void SetCapture() = 0;
   virtual void ReleaseCapture() = 0;
 
-  // |context| is NULL when loaded into separate process.
-  static scoped_ptr<NativeViewport> Create(shell::Context* context,
-                                           NativeViewportDelegate* delegate);
+  static scoped_ptr<NativeViewport> Create(NativeViewportDelegate* delegate);
 };
 
 }  // namespace services