[sync] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

sync/internal_api/public/util/weak_handle.cc

Index: sync/internal_api/public/util/weak_handle.cc
diff --git a/sync/internal_api/public/util/weak_handle.cc b/sync/internal_api/public/util/weak_handle.cc
index 0ed142ee35b03be5b048bea74f228cc8e3eae58c..e0864edeb38181f61774cf662ee83f8a5b5447fe 100644
--- a/sync/internal_api/public/util/weak_handle.cc
+++ b/sync/internal_api/public/util/weak_handle.cc
@@ -8,17 +8,17 @@
 
 #include "base/callback.h"
 #include "base/location.h"
-#include "base/message_loop/message_loop_proxy.h"
+#include "base/thread_task_runner_handle.h"
 
 namespace syncer {
 
 namespace internal {
 
 WeakHandleCoreBase::WeakHandleCoreBase()
-    : owner_loop_proxy_(base::MessageLoopProxy::current()) {}
+    : owner_loop_task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
 
 bool WeakHandleCoreBase::IsOnOwnerThread() const {
-  return owner_loop_proxy_->BelongsToCurrentThread();
+  return owner_loop_task_runner_->BelongsToCurrentThread();
 }
 
 WeakHandleCoreBase::~WeakHandleCoreBase() {}
@@ -26,7 +26,7 @@ WeakHandleCoreBase::~WeakHandleCoreBase() {}
 void WeakHandleCoreBase::PostToOwnerThread(
     const tracked_objects::Location& from_here,
     const base::Closure& fn) const {
-  if (!owner_loop_proxy_->PostTask(from_here, fn)) {
+  if (!owner_loop_task_runner_->PostTask(from_here, fn)) {
     DVLOG(1) << "Could not post task from " << from_here.ToString();
   }
 }