Switch from Delegate to Observer.

components/arc/BUILD.gn

 # 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.
 
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 static_library("arc") {
   sources = [
     "arc_bridge_bootstrap.cc",
@@ skipping 147 matching lines @@
   use_new_wrapper_types = false
 }
 
 static_library("arc_test_support") {
   testonly = true
   sources = [
     "test/fake_app_instance.cc",
     "test/fake_app_instance.h",
     "test/fake_arc_bridge_bootstrap.cc",
     "test/fake_arc_bridge_bootstrap.h",
-    "test/fake_arc_bridge_instance.cc",
-    "test/fake_arc_bridge_instance.h",
     "test/fake_arc_bridge_service.cc",
     "test/fake_arc_bridge_service.h",
     "test/fake_bluetooth_instance.cc",
     "test/fake_bluetooth_instance.h",
     "test/fake_intent_helper_instance.cc",
     "test/fake_intent_helper_instance.h",
     "test/fake_notifications_instance.cc",
     "test/fake_notifications_instance.h",
     "test/fake_policy_instance.cc",
     "test/fake_policy_instance.h",
@@ skipping 33 matching lines @@
     "//mojo/public/cpp/system:system",
     "//testing/gtest",
     "//ui/aura",
     "//ui/base:test_support",
     "//ui/base/ime",
     "//ui/events",
     "//ui/events:dom_keycode_converter",
     "//url:url",
   ]
 }