arc: Remove ArcServiceManager::Observer

components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc

 // Copyright 2016 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 "components/arc/intent_helper/arc_intent_helper_bridge.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_service_manager.h"
 #include "components/arc/common/intent_helper.mojom.h"
 #include "components/arc/intent_helper/activity_icon_loader.h"
 #include "components/arc/intent_helper/local_activity_resolver.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace arc {
 
 namespace {
 
 class ArcIntentHelperTest : public testing::Test {
@@ skipping 137 matching lines @@
   instance_->OnIntentFiltersUpdated(std::vector<IntentFilter>());
   EXPECT_TRUE(observer->IsUpdated());
 
   // Observer should not be called after it's removed.
   observer->Reset();
   instance_->RemoveObserver(observer.get());
   instance_->OnIntentFiltersUpdated(std::vector<IntentFilter>());
   EXPECT_FALSE(observer->IsUpdated());
 }
 
+// Tests if the getter works as expected.
+TEST_F(ArcIntentHelperTest, TestGet) {
+  // The getter should return null when nullptr is passed in.
+  EXPECT_EQ(nullptr, ArcIntentHelperBridge::Get(nullptr));
+
+  // The getter should return null when the manager doesn't have an
+  // ArcIntentHelperBridge instance.
+  ArcServiceManager manager(nullptr);
+  EXPECT_EQ(nullptr, ArcIntentHelperBridge::Get(&manager));
+
+  // Register the instance and retry. The getter should return non-null this
+  // time.
+  manager.AddService(std::move(instance_));
+  EXPECT_NE(nullptr, ArcIntentHelperBridge::Get(&manager));
+}
+
 }  // namespace arc