Make ui_controls only usable from interactive_ui_tests. This has two benefits:

ui/ui_controls/ui_controls_aura.h

 // Copyright (c) 2012 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_UI_CONTROLS_UI_CONTROLS_AURA_H_
 #define UI_UI_CONTROLS_UI_CONTROLS_AURA_H_
 
 #include "base/callback_forward.h"
 #include "ui/base/keycodes/keyboard_codes.h"
-#include "ui/base/ui_export.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ui_controls/ui_controls.h"
 
 namespace ui_controls {
 
 // An interface to provide Aura implementation of UI control.
-class UI_EXPORT UIControlsAura {
+class UIControlsAura {
  public:
   UIControlsAura();
   virtual ~UIControlsAura();
 
   virtual bool SendKeyPress(gfx::NativeWindow window,
                             ui::KeyboardCode key,
                             bool control,
                             bool shift,
                             bool alt,
                             bool command) = 0;
@@ skipping 21 matching lines @@
   virtual bool SendMouseClick(MouseButton type) = 0;
 
   // Runs |closure| after processing all pending ui events.
   virtual void RunClosureAfterAllPendingUIEvents(
       const base::Closure& closure) = 0;
 };
 
 }  // namespace ui_controls
 
 #endif  // UI_UI_CONTROLS_UI_CONTROLS_AURA_H_