Remove remaining calls to deprecated MessageLoop methods.

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

 // Copyright 2013 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 <stdint.h>
 #include <utility>
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "mojo/public/cpp/bindings/binding.h"
@@ skipping 139 matching lines @@
   ScopedMessagePipeHandle pipe1_;
   Binding<sample::Factory> binding_;
 };
 
 class HandlePassingTest : public testing::Test {
  public:
   HandlePassingTest() {}
 
   void TearDown() override { PumpMessages(); }
 
-  void PumpMessages() { loop_.RunUntilIdle(); }
+  void PumpMessages() { base::RunLoop().RunUntilIdle(); }
 
  private:
   base::MessageLoop loop_;
 };
 
 void DoStuff(bool* got_response,
              std::string* got_text_reply,
              const base::Closure& closure,
              sample::ResponsePtr response,
              String text_reply) {
@@ skipping 178 matching lines @@
   run_loop.Run();
   run_loop2.Run();
 
   EXPECT_EQ(std::string("object1"), name1);
   EXPECT_EQ(std::string("object2"), name2);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo