[Chromoting] Use device::PowerSaveBlocker to block screen saver

remoting/host/chromoting_host_unittest.cc

Index: remoting/host/chromoting_host_unittest.cc
diff --git a/remoting/host/chromoting_host_unittest.cc b/remoting/host/chromoting_host_unittest.cc
index 6b65884a58b2259ca0ff76200343eaa6d5fbfd27..50c278f24ff4862e412640f52393af57f2c605ee 100644
--- a/remoting/host/chromoting_host_unittest.cc
+++ b/remoting/host/chromoting_host_unittest.cc
@@ -58,17 +58,16 @@ class ChromotingHostTest : public testing::Test {
   ChromotingHostTest() {}
 
   void SetUp() override {
-    task_runner_ = new AutoThreadTaskRunner(message_loop_.task_runner(),
-                                            base::Bind(&base::DoNothing));
-
     desktop_environment_factory_.reset(new FakeDesktopEnvironmentFactory());
     session_manager_ = new protocol::MockSessionManager();
+    context_ = ChromotingHostContext::CreateForTest(
+            new AutoThreadTaskRunner(message_loop_.task_runner(),
+                base::Bind(&base::DoNothing)));
 
     host_.reset(new ChromotingHost(
         desktop_environment_factory_.get(), base::WrapUnique(session_manager_),
         protocol::TransportContext::ForTests(protocol::TransportRole::SERVER),
-        task_runner_,    // Audio
-        task_runner_));  // Video encode
+        *context_));
     host_->AddStatusObserver(&host_status_observer_);
 
     xmpp_login_ = "host@domain";
@@ -125,9 +124,8 @@ class ChromotingHostTest : public testing::Test {
     std::unique_ptr<protocol::ConnectionToClient> connection = std::move(
         (connection_index == 0) ? owned_connection1_ : owned_connection2_);
     protocol::ConnectionToClient* connection_ptr = connection.get();
-    std::unique_ptr<ClientSession> client(new ClientSession(
-        host_.get(), task_runner_ /* audio_task_runner */,
-        std::move(connection), desktop_environment_factory_.get(),
+    std::unique_ptr<ClientSession> client(new ClientSession(*context_,
+        host_.get(), std::move(connection), desktop_environment_factory_.get(),
         base::TimeDelta(), nullptr, std::vector<HostExtension*>()));
     ClientSession* client_ptr = client.get();
 
@@ -150,7 +148,7 @@ class ChromotingHostTest : public testing::Test {
   void TearDown() override {
     if (host_)
       ShutdownHost();
-    task_runner_ = nullptr;
+    context_ = nullptr;
 
     message_loop_.RunUntilIdle();
   }
@@ -205,7 +203,7 @@ class ChromotingHostTest : public testing::Test {
 
  protected:
   base::MessageLoop message_loop_;
-  scoped_refptr<AutoThreadTaskRunner> task_runner_;
+  std::unique_ptr<ChromotingHostContext> context_;
   MockConnectionToClientEventHandler handler_;
   std::unique_ptr<FakeDesktopEnvironmentFactory> desktop_environment_factory_;
   MockHostStatusObserver host_status_observer_;