arc: Remove ArcServiceManager::Observer

components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc

Index: components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc
diff --git a/components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc b/components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc
index d849fe0b5193f8c04ced28b88961225f33653cf5..774f8b301ccf6190788be5c18cda39e4f979a899 100644
--- a/components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc
+++ b/components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc
@@ -8,6 +8,7 @@
 
 #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"
@@ -165,4 +166,20 @@ TEST_F(ArcIntentHelperTest, TestObserver) {
   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