Reduce usage of MessageLoopProxy in base/

base/files/file_path_watcher_fsevents.cc

Index: base/files/file_path_watcher_fsevents.cc
diff --git a/base/files/file_path_watcher_fsevents.cc b/base/files/file_path_watcher_fsevents.cc
index f658efe742b43e325c441402cdc6931bfac41e2f..7385a8ba891d8d1bd5d2a2620cba6da88ec4274d 100644
--- a/base/files/file_path_watcher_fsevents.cc
+++ b/base/files/file_path_watcher_fsevents.cc
@@ -13,6 +13,8 @@
 #include "base/mac/libdispatch_task_runner.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/message_loop/message_loop.h"
+#include "base/sequenced_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 
 namespace base {
 
@@ -118,14 +120,14 @@ FilePathWatcherFSEvents::FilePathWatcherFSEvents() : fsevent_stream_(NULL) {
 
 void FilePathWatcherFSEvents::OnFilePathsChanged(
     const std::vector<FilePath>& paths) {
-  if (!message_loop()->BelongsToCurrentThread()) {
-    message_loop()->PostTask(
+  if (!task_runner()->RunsTasksOnCurrentThread()) {
+    task_runner()->PostTask(
         FROM_HERE,
         Bind(&FilePathWatcherFSEvents::OnFilePathsChanged, this, paths));
     return;
   }
 
-  DCHECK(message_loop()->BelongsToCurrentThread());
+  DCHECK(task_runner()->RunsTasksOnCurrentThread());
   if (resolved_target_.empty())
     return;
 
@@ -149,7 +151,7 @@ bool FilePathWatcherFSEvents::Watch(const FilePath& path,
   if (!recursive)
     return false;
 
-  set_message_loop(MessageLoopProxy::current());
+  set_task_runner(ThreadTaskRunnerHandle::Get());
   callback_ = callback;
   target_ = path;
 
@@ -180,7 +182,7 @@ void FilePathWatcherFSEvents::Cancel() {
 
 void FilePathWatcherFSEvents::CancelOnMessageLoopThread() {
   // For all other implementations, the "message loop thread" is the IO thread,
-  // as returned by message_loop(). This implementation, however, needs to
+  // as returned by task_runner(). This implementation, however, needs to
   // cancel pending work on the Dipatch Queue thread.
   DCHECK(g_task_runner.Get().RunsTasksOnCurrentThread());
 
@@ -231,7 +233,7 @@ void FilePathWatcherFSEvents::UpdateEventStream(
                                 g_task_runner.Get().GetDispatchQueue());
 
   if (!FSEventStreamStart(fsevent_stream_))
-    message_loop()->PostTask(FROM_HERE, Bind(callback_, target_, true));
+    task_runner()->PostTask(FROM_HERE, Bind(callback_, target_, true));
 }
 
 bool FilePathWatcherFSEvents::ResolveTargetPath() {
@@ -240,7 +242,7 @@ bool FilePathWatcherFSEvents::ResolveTargetPath() {
   bool changed = resolved != resolved_target_;
   resolved_target_ = resolved;
   if (resolved_target_.empty())
-    message_loop()->PostTask(FROM_HERE, Bind(callback_, target_, true));
+    task_runner()->PostTask(FROM_HERE, Bind(callback_, target_, true));
   return changed;
 }