Revert of Change mojo_public_bindings_unittests to use chromium environment.

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

Index: third_party/mojo/src/mojo/public/cpp/bindings/tests/equals_unittest.cc
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/tests/equals_unittest.cc b/third_party/mojo/src/mojo/public/cpp/bindings/tests/equals_unittest.cc
index 5306f1f6cc4ab989f4b2f34e430b0605ae5164ab..72b02d413de560a4e404c558ddd95f961199a7db 100644
--- a/third_party/mojo/src/mojo/public/cpp/bindings/tests/equals_unittest.cc
+++ b/third_party/mojo/src/mojo/public/cpp/bindings/tests/equals_unittest.cc
@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/bindings/lib/value_traits.h"
+#include "mojo/public/cpp/environment/environment.h"
 #include "mojo/public/interfaces/bindings/tests/test_structs.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -20,9 +21,14 @@
   return r.Pass();
 }
 
-using EqualsTest = testing::Test;
+class EqualsTest : public testing::Test {
+ public:
+  ~EqualsTest() override {}
 
-}  // namespace
+ private:
+  Environment env_;
+};
+}
 
 TEST_F(EqualsTest, NullStruct) {
   RectPtr r1;