Remove requirement that mojo::Environment be instantiated.

mojo/public/cpp/bindings/tests/serialization_api_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 "mojo/public/cpp/bindings/array.h"
 #include "mojo/public/cpp/bindings/lib/array_serialization.h"
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 #include "mojo/public/interfaces/bindings/tests/rect.mojom.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom.h"
@@ skipping 29 matching lines @@
     EXPECT_EQ(expected_validation_error, actual_validation_error);
 
     Type out_val;
     bool deserialize_ret = out_val.Deserialize(bytes.data(), bytes.size());
     if (actual_validation_error == mojo::internal::ValidationError::NONE) {
       EXPECT_TRUE(val->Equals(out_val));
     }
     EXPECT_EQ(actual_validation_error == mojo::internal::ValidationError::NONE,
               deserialize_ret);
   }
-
- private:
-  Environment env_;
 };
 
 TEST_F(StructSerializationAPITest, GetSerializedSize) {
   Rect rect;
   // 8 byte struct header
   // + 16 bytes worth of fields
   EXPECT_EQ(24u, rect.GetSerializedSize());
 
   HandleStruct handle_struct;
   // 8 byte struct header
@@ skipping 136 matching lines @@
   // don't Validate.
   co_data->header_.num_bytes = 0u;
   co.DeserializeWithoutValidation(buf);
   EXPECT_EQ(kMagic, co_data->other);
   EXPECT_EQ(0u, co_data->header_.num_bytes);
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo