Remove requirement that mojo::Environment be instantiated.

mojo/public/cpp/bindings/tests/binding_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.
 
 // Note: This file tests both binding.h (mojo::Binding) and strong_binding.h
 // (mojo::StrongBinding).
 
 #include "mojo/public/cpp/bindings/binding.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
-#include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/public/interfaces/bindings/tests/sample_interfaces.mojom.h"
 #include "mojo/public/interfaces/bindings/tests/sample_service.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace {
 
 class BindingTestBase : public testing::Test {
  public:
   BindingTestBase() {}
   ~BindingTestBase() override {}
 
   RunLoop& loop() { return loop_; }
 
  private:
-  Environment env_;
   RunLoop loop_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(BindingTestBase);
 };
 
 class ServiceImpl : public sample::Service {
  public:
   explicit ServiceImpl(bool* was_deleted = nullptr)
       : was_deleted_(was_deleted) {}
   ~ServiceImpl() override {
@@ skipping 291 matching lines @@
 // Tests that StrongBinding::Unbind() compiles.
 TEST_F(BindingTest, StrongBindingUnbindCompile) {
   ServiceImpl impl;
   sample::ServicePtr ptr;
   StrongBinding<sample::Service> binding(&impl, GetProxy(&ptr));
   binding.Unbind();
 }
 
 }  // namespace
 }  // namespace mojo