Remove requirement that mojo::Environment be instantiated.

mojo/public/cpp/bindings/tests/synchronous_connector_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 "mojo/public/cpp/bindings/lib/synchronous_connector.h"
 
 #include <string.h>
 #include <string>
 #include <utility>
 
@@ skipping 28 matching lines @@
   Message message_received;
   EXPECT_TRUE(connector1.BlockingRead(&message_received));
 
   EXPECT_EQ(
       kText,
       std::string(reinterpret_cast<const char*>(message_received.payload())));
 }
 
 // Writing to a closed pipe should fail.
 TEST(SynchronousConnectorTest, WriteToClosedPipe) {
-  Environment env;
   MessagePipe pipe;
   internal::SynchronousConnector connector0(std::move(pipe.handle0));
 
   // Close the other end of the pipe.
   pipe.handle1.reset();
 
   Message message;
   EXPECT_FALSE(connector0.Write(&message));
 }
 
 // Reading from a closed pipe should fail (while waiting on it).
 TEST(SynchronousConnectorTest, ReadFromClosedPipe) {
-  Environment env;
   MessagePipe pipe;
   internal::SynchronousConnector connector0(std::move(pipe.handle0));
 
   // Close the other end of the pipe.
   pipe.handle1.reset();
 
   Message message;
   EXPECT_FALSE(connector0.BlockingRead(&message));
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo