Replace MessageLoopProxy with ThreadTaskRunnerHandle in src/sync/.

sync/tools/sync_client.cc

Index: sync/tools/sync_client.cc
diff --git a/sync/tools/sync_client.cc b/sync/tools/sync_client.cc
index 2b626db4198b5479ebd9aa3b86e2541329cbbfa3..6f3e9e3ba15c07d53b591cf8fdbd5a99a079d345 100644
--- a/sync/tools/sync_client.cc
+++ b/sync/tools/sync_client.cc
@@ -82,8 +82,8 @@ class MyTestURLRequestContext : public net::TestURLRequestContext {
 class MyTestURLRequestContextGetter : public net::TestURLRequestContextGetter {
  public:
   explicit MyTestURLRequestContextGetter(
-      const scoped_refptr<base::MessageLoopProxy>& io_message_loop_proxy)
-      : TestURLRequestContextGetter(io_message_loop_proxy) {}
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner)
+      : TestURLRequestContextGetter(io_task_runner) {}
 
   virtual net::TestURLRequestContext* GetURLRequestContext() OVERRIDE {
     // Construct |context_| lazily so it gets constructed on the right