Use SingleThreadTaskRunner instead of MessageLoopProxy in remoting/host.

remoting/host/policy_hack/nat_policy.cc

 // Copyright (c) 2012 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.
 
 // Most of this code is copied from:
 //   src/chrome/browser/policy/asynchronous_policy_loader.{h,cc}
 
 #include "remoting/host/policy_hack/nat_policy.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
-#include "base/message_loop_proxy.h"
+#include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/time.h"
 #include "base/values.h"
 
 namespace remoting {
 namespace policy_hack {
 
 namespace {
 // The time interval for rechecking policy. This is our fallback in case the
 // delegate never reports a change to the ReloadObserver.
 const int kFallbackReloadDelayMinutes = 15;
 
 }  // namespace
 
 const char NatPolicy::kNatPolicyName[] = "RemoteAccessHostFirewallTraversal";
 
-NatPolicy::NatPolicy(base::MessageLoopProxy* message_loop_proxy)
-    : message_loop_proxy_(message_loop_proxy),
+NatPolicy::NatPolicy(scoped_refptr<base::SingleThreadTaskRunner> task_runner)
+    : task_runner_(task_runner),
       current_nat_enabled_state_(false),
       first_state_published_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
 }
 
 NatPolicy::~NatPolicy() {
 }
 
 void NatPolicy::StartWatching(const NatEnabledCallback& nat_enabled_cb) {
   if (!OnPolicyThread()) {
-    message_loop_proxy_->PostTask(FROM_HERE,
-                                  base::Bind(&NatPolicy::StartWatching,
-                                             base::Unretained(this),
-                                             nat_enabled_cb));
+    task_runner_->PostTask(FROM_HERE,
+                           base::Bind(&NatPolicy::StartWatching,
+                                      base::Unretained(this),
+                                      nat_enabled_cb));
     return;
   }
 
   nat_enabled_cb_ = nat_enabled_cb;
   StartWatchingInternal();
 }
 
 void NatPolicy::StopWatching(base::WaitableEvent* done) {
   if (!OnPolicyThread()) {
-    message_loop_proxy_->PostTask(FROM_HERE,
-                                  base::Bind(&NatPolicy::StopWatching,
-                                             base::Unretained(this), done));
+    task_runner_->PostTask(FROM_HERE,
+                           base::Bind(&NatPolicy::StopWatching,
+                                      base::Unretained(this), done));
     return;
   }
 
   StopWatchingInternal();
   weak_factory_.InvalidateWeakPtrs();
   nat_enabled_cb_.Reset();
 
   done->Signal();
 }
 
 void NatPolicy::ScheduleFallbackReloadTask() {
   DCHECK(OnPolicyThread());
   ScheduleReloadTask(
       base::TimeDelta::FromMinutes(kFallbackReloadDelayMinutes));
 }
 
 void NatPolicy::ScheduleReloadTask(const base::TimeDelta& delay) {
   DCHECK(OnPolicyThread());
-  message_loop_proxy_->PostDelayedTask(
+  task_runner_->PostDelayedTask(
       FROM_HERE,
       base::Bind(&NatPolicy::Reload, weak_factory_.GetWeakPtr()),
       delay);
 }
 
 bool NatPolicy::OnPolicyThread() const {
-  return message_loop_proxy_->BelongsToCurrentThread();
+  return task_runner_->BelongsToCurrentThread();
 }
 
 void NatPolicy::UpdateNatPolicy(base::DictionaryValue* new_policy) {
   DCHECK(OnPolicyThread());
   bool new_nat_enabled_state = false;
   if (!new_policy->HasKey(kNatPolicyName)) {
     // If unspecified, the default value of this policy is true.
     new_nat_enabled_state = true;
   } else {
     // Otherwise, try to parse the value and only change from false if we get
     // a successful read.
     base::Value* value;
     if (new_policy->Get(kNatPolicyName, &value) &&
         value->IsType(base::Value::TYPE_BOOLEAN)) {
       CHECK(value->GetAsBoolean(&new_nat_enabled_state));
     }
   }
 
   if (!first_state_published_ ||
       (new_nat_enabled_state != current_nat_enabled_state_)) {
     first_state_published_ = true;
     current_nat_enabled_state_ = new_nat_enabled_state;
     nat_enabled_cb_.Run(current_nat_enabled_state_);
   }
 }
 
 }  // namespace policy_hack
 }  // namespace remoting