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

ui/aura/test/aura_test_helper.cc

 // 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.
 
 #include "ui/aura/test/aura_test_helper.h"
 
 #include "base/message_loop.h"
 #include "base/run_loop.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/test_activation_client.h"
 #include "ui/aura/test/test_screen.h"
 #include "ui/aura/test/test_stacking_client.h"
-#include "ui/aura/ui_controls_aura.h"
 #include "ui/base/test/dummy_input_method.h"
 #include "ui/compositor/layer_animator.h"
 #include "ui/gfx/screen.h"
-#include "ui/ui_controls/ui_controls.h"
 
 namespace aura {
 namespace test {
 
 AuraTestHelper::AuraTestHelper(MessageLoopForUI* message_loop)
     : setup_called_(false),
       teardown_called_(false),
       owns_root_window_(false) {
   DCHECK(message_loop);
   message_loop_ = message_loop;
   // Disable animations during tests.
   ui::LayerAnimator::set_disable_animations_for_test(true);
 }
 
 AuraTestHelper::~AuraTestHelper() {
   CHECK(setup_called_)
       << "You have overridden SetUp but never called super class's SetUp";
   CHECK(teardown_called_)
       << "You have overridden TearDown but never called super class's TearDown";
 }
 
 void AuraTestHelper::SetUp() {
   setup_called_ = true;
   Env::GetInstance();
   test_screen_.reset(new TestScreen());
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, test_screen_.get());
   root_window_.reset(test_screen_->CreateRootWindowForPrimaryDisplay());
-  ui_controls::InstallUIControlsAura(CreateUIControlsAura(root_window_.get()));
 
   focus_client_.reset(new FocusManager);
   client::SetFocusClient(root_window_.get(), focus_client_.get());
   stacking_client_.reset(new TestStackingClient(root_window_.get()));
   test_activation_client_.reset(
       new test::TestActivationClient(root_window_.get()));
   capture_client_.reset(new client::DefaultCaptureClient(root_window_.get()));
   test_input_method_.reset(new ui::test::DummyInputMethod);
   root_window_->SetProperty(
       client::kRootWindowInputMethodKey,
@@ skipping 21 matching lines @@
 #if !defined(OS_MACOSX)
   // TODO(jbates) crbug.com/134753 Find quitters of this RunLoop and have them
   //              use run_loop.QuitClosure().
   base::RunLoop run_loop(Env::GetInstance()->GetDispatcher());
   run_loop.RunUntilIdle();
 #endif
 }
 
 }  // namespace test
 }  // namespace aura