Remove use of deprecated MessageLoop methods in chromeos.

chromeos/dbus/mock_cryptohome_client.cc

Index: chromeos/dbus/mock_cryptohome_client.cc
diff --git a/chromeos/dbus/mock_cryptohome_client.cc b/chromeos/dbus/mock_cryptohome_client.cc
index 66fbaa2dac45f03bcf91a446c8b724fc3f0fdf62..0e860d63da28eb7a70eec971e78da8a5f3998c58 100644
--- a/chromeos/dbus/mock_cryptohome_client.cc
+++ b/chromeos/dbus/mock_cryptohome_client.cc
@@ -5,7 +5,9 @@
 #include "chromeos/dbus/mock_cryptohome_client.h"
 
 #include "base/bind.h"
-#include "base/message_loop/message_loop.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 
 using ::testing::_;
 using ::testing::AnyNumber;
@@ -17,7 +19,7 @@ namespace {
 
 // Runs callback with true.
 void RunCallbackWithTrue(const BoolDBusMethodCallback& callback) {
-  base::MessageLoop::current()->PostTask(
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS, true));
 }