Reduce usage of MessageLoopProxy in base/

base/prefs/pref_member.h

Index: base/prefs/pref_member.h
diff --git a/base/prefs/pref_member.h b/base/prefs/pref_member.h
index 17f5b447eb4a6f3a1f58985b6e7be0b7dc718c5c..4d4540a904fc178b913ee0f6522851a0d391033c 100644
--- a/base/prefs/pref_member.h
+++ b/base/prefs/pref_member.h
@@ -33,9 +33,9 @@
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "base/prefs/base_prefs_export.h"
 #include "base/prefs/pref_observer.h"
+#include "base/sequenced_task_runner.h"
 #include "base/values.h"
 
 class PrefService;
@@ -65,8 +65,8 @@ class BASE_PREFS_EXPORT PrefMemberBase : public PrefObserver {
                      bool is_user_modifiable,
                      const base::Closure& callback) const;
 
-    void MoveToThread(
-        const scoped_refptr<base::MessageLoopProxy>& message_loop);
+    void MoveToTaskRunner(
+        const scoped_refptr<base::SequencedTaskRunner>& task_runner);
 
     // See PrefMember<> for description.
     bool IsManaged() const {
@@ -92,7 +92,7 @@ class BASE_PREFS_EXPORT PrefMemberBase : public PrefObserver {
 
     bool IsOnCorrectThread() const;
 
-    scoped_refptr<base::MessageLoopProxy> thread_loop_;
+    scoped_refptr<base::SequencedTaskRunner> task_runner_;
     mutable bool is_managed_;
     mutable bool is_user_modifiable_;
 
@@ -112,7 +112,8 @@ class BASE_PREFS_EXPORT PrefMemberBase : public PrefObserver {
   // See PrefMember<> for description.
   void Destroy();
 
-  void MoveToThread(const scoped_refptr<base::MessageLoopProxy>& message_loop);
+  void MoveToTaskRunner(
+      const scoped_refptr<base::SequencedTaskRunner>& task_runner);
 
   // PrefObserver
   virtual void OnPreferenceChanged(PrefService* service,
@@ -184,7 +185,7 @@ class PrefMember : public subtle::PrefMemberBase {
 
   // Unsubscribes the PrefMember from the PrefService. After calling this
   // function, the PrefMember may not be used any more on the UI thread.
-  // Assuming |MoveToThread| was previously called, |GetValue|, |IsManaged|,
+  // Assuming |MoveToTaskRunner| was previously called, |GetValue|, |IsManaged|,
   // and |IsUserModifiable| can still be called from the other thread but
   // the results will no longer update from the PrefService.
   // This method should only be called on the UI thread.
@@ -197,15 +198,16 @@ class PrefMember : public subtle::PrefMemberBase {
   // via PostTask.
   // This method should only be used from the thread the PrefMember is currently
   // on, which is the UI thread by default.
-  void MoveToThread(const scoped_refptr<base::MessageLoopProxy>& message_loop) {
-    subtle::PrefMemberBase::MoveToThread(message_loop);
+  void MoveToTaskRunner(
+      const scoped_refptr<base::SequencedTaskRunner>& task_runner) {
+    subtle::PrefMemberBase::MoveToTaskRunner(task_runner);
   }
 
   // Check whether the pref is managed, i.e. controlled externally through
   // enterprise configuration management (e.g. windows group policy). Returns
   // false for unknown prefs.
   // This method should only be used from the thread the PrefMember is currently
-  // on, which is the UI thread unless changed by |MoveToThread|.
+  // on, which is the UI thread unless changed by |MoveToTaskRunner|.
   bool IsManaged() const {
     VerifyPref();
     return internal_->IsManaged();
@@ -215,7 +217,7 @@ class PrefMember : public subtle::PrefMemberBase {
   // when the pref is managed by a policy or an extension, and when a command
   // line flag overrides the pref.
   // This method should only be used from the thread the PrefMember is currently
-  // on, which is the UI thread unless changed by |MoveToThread|.
+  // on, which is the UI thread unless changed by |MoveToTaskRunner|.
   bool IsUserModifiable() const {
     VerifyPref();
     return internal_->IsUserModifiable();
@@ -223,7 +225,7 @@ class PrefMember : public subtle::PrefMemberBase {
 
   // Retrieve the value of the member variable.
   // This method should only be used from the thread the PrefMember is currently
-  // on, which is the UI thread unless changed by |MoveToThread|.
+  // on, which is the UI thread unless changed by |MoveToTaskRunner|.
   ValueType GetValue() const {
     VerifyPref();
     return internal_->value();