Remove remaining calls to deprecated MessageLoop methods.

mojo/public/cpp/bindings/tests/sync_method_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 229 matching lines @@
 
   mutable base::Lock lock_;
   bool ping_called_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSyncServiceThread);
 };
 
 class SyncMethodTest : public testing::Test {
  public:
   SyncMethodTest() {}
-  ~SyncMethodTest() override { loop_.RunUntilIdle(); }
+  ~SyncMethodTest() override { base::RunLoop().RunUntilIdle(); }
 
  protected:
   base::MessageLoop loop_;
 };
 
 template <typename T>
 class SyncMethodCommonTest : public SyncMethodTest {
  public:
   SyncMethodCommonTest() {}
   ~SyncMethodCommonTest() override {}
@@ skipping 472 matching lines @@
   int32_t result_value = -1;
   ASSERT_TRUE(master_ptr_->Echo(456, &result_value));
   EXPECT_EQ(456, result_value);
 }
 
 // TODO(yzshen): Add more tests related to associated interfaces.
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo