Fix compile error on simple chrome.

components/arc/arc_bridge_service_unittest.cc

 // Copyright 2015 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 <memory>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 40 matching lines @@
         service_->GetBootstrapForTesting());
   }
 
  protected:
   std::unique_ptr<ArcBridgeServiceImpl> service_;
   ArcBridgeService::StopReason stop_reason_;
 
   static std::unique_ptr<ArcBridgeBootstrap> CreateSuspendedBootstrap() {
     auto bootstrap = base::MakeUnique<FakeArcBridgeBootstrap>();
     bootstrap->SuspendBoot();
-    return bootstrap;
+    return std::move(bootstrap);
   }
 
   static std::unique_ptr<ArcBridgeBootstrap> CreateBootFailureBootstrap(
       ArcBridgeService::StopReason reason) {
     auto bootstrap = base::MakeUnique<FakeArcBridgeBootstrap>();
     bootstrap->EnableBootFailureEmulation(reason);
-    return bootstrap;
+    return std::move(bootstrap);
   }
 
  private:
   void SetUp() override {
     chromeos::DBusThreadManager::Initialize();
 
     ready_ = false;
     state_ = ArcBridgeService::State::STOPPED;
     stop_reason_ = ArcBridgeService::StopReason::SHUTDOWN;
 
@@ skipping 113 matching lines @@
 }
 
 // Removing an unknown observer should be allowed.
 TEST_F(ArcBridgeTest, RemoveUnknownObserver) {
   ASSERT_FALSE(ready());
   auto dummy_observer = base::MakeUnique<DummyObserver>();
   service_->RemoveObserver(dummy_observer.get());
 }
 
 }  // namespace arc