Use spin runloop instead of WaitForIncomingMethodCall() for test codes.

components/arc/test/fake_arc_bridge_instance.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 "components/arc/test/fake_arc_bridge_instance.h"
 
 #include <utility>
 
+#include "base/run_loop.h"
+
 namespace arc {
 
 FakeArcBridgeInstance::FakeArcBridgeInstance() : binding_(this) {}
 FakeArcBridgeInstance::~FakeArcBridgeInstance() {}
 
 void FakeArcBridgeInstance::Init(mojom::ArcBridgeHostPtr host) {
   host_ptr_ = std::move(host);
   init_calls_++;
+
+  // Wake WaitForInitCall().
+  if (!quit_closure_.is_null())
+    quit_closure_.Run();
+  quit_closure_.Reset();
 }
 
 void FakeArcBridgeInstance::Unbind() {
   host_ptr_.reset();
   if (binding_.is_bound())
     binding_.Close();
 }
 
 void FakeArcBridgeInstance::Bind(
     mojo::InterfaceRequest<mojom::ArcBridgeInstance> interface_request) {
   binding_.Bind(std::move(interface_request));
 }
 
 void FakeArcBridgeInstance::WaitForInitCall() {
-  binding_.WaitForIncomingMethodCall();
+  base::RunLoop run_loop;
+  quit_closure_ = run_loop.QuitClosure();
+  binding_.set_connection_error_handler(run_loop.QuitClosure());
+  run_loop.Run();
 }
 
 void FakeArcBridgeInstance::Stop(ArcBridgeService::StopReason reason) {
   if (!delegate_)
     return;
   delegate_->OnStopped(reason);
 }
 
 }  // namespace arc