Revert of Change mojo_public_bindings_unittests to use chromium environment.

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

Index: third_party/mojo/src/mojo/public/cpp/bindings/tests/handle_passing_unittest.cc
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/tests/handle_passing_unittest.cc b/third_party/mojo/src/mojo/public/cpp/bindings/tests/handle_passing_unittest.cc
index 8487d0a94fd1a880f458b769473b8d893b73ee36..f936361d05bcc1dbd9b70f80dc5b3be07dd60693 100644
--- a/third_party/mojo/src/mojo/public/cpp/bindings/tests/handle_passing_unittest.cc
+++ b/third_party/mojo/src/mojo/public/cpp/bindings/tests/handle_passing_unittest.cc
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/message_loop/message_loop.h"
-#include "mojo/message_pump/message_pump_mojo.h"
 #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/test_support/test_utils.h"
+#include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/public/interfaces/bindings/tests/sample_factory.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -137,14 +137,13 @@
 
 class HandlePassingTest : public testing::Test {
  public:
-  HandlePassingTest() : loop_(common::MessagePumpMojo::Create()) {}
-
   void TearDown() override { PumpMessages(); }
 
   void PumpMessages() { loop_.RunUntilIdle(); }
 
  private:
-  base::MessageLoop loop_;
+  Environment env_;
+  RunLoop loop_;
 };
 
 struct DoStuffCallback {