Revert of Change mojo_public_bindings_unittests to use chromium environment.

third_party/mojo/src/mojo/public/cpp/bindings/tests/sample_service_unittest.cc

Index: third_party/mojo/src/mojo/public/cpp/bindings/tests/sample_service_unittest.cc
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/tests/sample_service_unittest.cc b/third_party/mojo/src/mojo/public/cpp/bindings/tests/sample_service_unittest.cc
index 58878a7f0d33c7d607be75aca360c7ac5c445585..5d1617f446c097e9500e65eb4a03d73cf95fc1c2 100644
--- a/third_party/mojo/src/mojo/public/cpp/bindings/tests/sample_service_unittest.cc
+++ b/third_party/mojo/src/mojo/public/cpp/bindings/tests/sample_service_unittest.cc
@@ -6,6 +6,8 @@
 #include <ostream>
 #include <string>
 
+#include "mojo/public/cpp/environment/environment.h"
+#include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/interfaces/bindings/tests/sample_service.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -311,7 +313,16 @@
   }
 };
 
-using BindingsSampleTest = testing::Test;
+class BindingsSampleTest : public testing::Test {
+ public:
+  BindingsSampleTest() {}
+  ~BindingsSampleTest() override {}
+
+ private:
+  mojo::Environment env_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(BindingsSampleTest);
+};
 
 TEST_F(BindingsSampleTest, Basic) {
   SimpleMessageReceiver receiver;