Replace MessageLoopProxy with ThreadTaskRunnerHandle in src/sync/.

sync/internal_api/sync_context_proxy_impl_unittest.cc

Index: sync/internal_api/sync_context_proxy_impl_unittest.cc
diff --git a/sync/internal_api/sync_context_proxy_impl_unittest.cc b/sync/internal_api/sync_context_proxy_impl_unittest.cc
index 18f5bbfea5b6352afdd912f7b5b4dbfea252e624..660670dbd827d3c755d993778f4dde4df3eb2f8b 100644
--- a/sync/internal_api/sync_context_proxy_impl_unittest.cc
+++ b/sync/internal_api/sync_context_proxy_impl_unittest.cc
@@ -3,9 +3,9 @@
 // found in the LICENSE file.
 
 #include "base/message_loop/message_loop.h"
-#include "base/message_loop/message_loop_proxy.h"
 #include "base/run_loop.h"
 #include "base/sequenced_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 #include "sync/engine/model_type_sync_proxy_impl.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/sync_context.h"
@@ -18,8 +18,8 @@ namespace syncer {
 class SyncContextProxyImplTest : public ::testing::Test {
  public:
   SyncContextProxyImplTest()
-      : sync_task_runner_(base::MessageLoopProxy::current()),
-        type_task_runner_(base::MessageLoopProxy::current()),
+      : sync_task_runner_(base::ThreadTaskRunnerHandle::Get()),
+        type_task_runner_(base::ThreadTaskRunnerHandle::Get()),
         registry_(new ModelTypeRegistry()),
         context_proxy_(sync_task_runner_, registry_->AsWeakPtr()) {}