Split the //mojo/public/cpp/test_support:test_utils target.

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

 // Copyright 2015 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 "build/build_config.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 #include "mojo/public/cpp/bindings/string.h"
 #include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/system/message_pipe.h"
-#include "mojo/public/cpp/test_support/test_support.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/public/interfaces/bindings/tests/sample_interfaces.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 //
 // The tests in this file are designed to test the interaction between a
 // Callback and its associated Binding. If a Callback is deleted before
 // being used we DCHECK fail--unless the associated Binding has already
 // been closed or deleted. This contract must be explained to the Mojo
@@ skipping 270 matching lines @@
   // Delete the callback without running it. This should cause a crash in debug
   // builds due to a DCHECK.
   EXPECT_DEATH_IF_SUPPORTED(server_impl.DeleteCallback(),
                             "Check failed: !callback_was_dropped.");
 #endif
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo