Move test-only ContextFactory implementations out of production targets

ui/compositor/reflector.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_COMPOSITOR_REFLECTOR_H_
 #define UI_COMPOSITOR_REFLECTOR_H_
 
-#include "ui/compositor/compositor_export.h"
+#include "base/memory/ref_counted.h"
 
 namespace ui {
 
-class COMPOSITOR_EXPORT Reflector
-    : public base::RefCountedThreadSafe<Reflector> {
+class Reflector : public base::RefCountedThreadSafe<Reflector> {
  public:
   Reflector() {}
 
   virtual void OnMirroringCompositorResized() {}
 
  protected:
   friend class base::RefCountedThreadSafe<Reflector>;
   virtual ~Reflector() {}
 
   DISALLOW_COPY_AND_ASSIGN(Reflector);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_REFLECTOR_H_