Mojo: Use the MessagePipe creation helper whenever possible/reasonable in tests.

mojo/public/cpp/bindings/tests/connector_unittest.cc

Index: mojo/public/cpp/bindings/tests/connector_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/connector_unittest.cc b/mojo/public/cpp/bindings/tests/connector_unittest.cc
index 4767b98f87c38fc2edae47ea9e2f666e401eb04d..f5a4eb79fc5a9b7002c0a68c5708a240fd6c8082 100644
--- a/mojo/public/cpp/bindings/tests/connector_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/connector_unittest.cc
@@ -180,7 +180,6 @@ TEST_F(ConnectorTest, WriteToClosedPipe) {
   EXPECT_TRUE(connector0.encountered_error());
 }
 
-// Enable this test once MojoWriteMessage supports passing handles.
 TEST_F(ConnectorTest, MessageWithHandles) {
   internal::Connector connector0(handle0_.Pass());
   internal::Connector connector1(handle1_.Pass());
@@ -190,9 +189,8 @@ TEST_F(ConnectorTest, MessageWithHandles) {
   Message message1;
   AllocMessage(kText, &message1);
 
-  ScopedMessagePipeHandle handles[2];
-  CreateMessagePipe(&handles[0], &handles[1]);
-  message1.mutable_handles()->push_back(handles[0].release());
+  MessagePipe pipe;
+  message1.mutable_handles()->push_back(pipe.handle0.release());
 
   connector0.Accept(&message1);
 
@@ -223,7 +221,7 @@ TEST_F(ConnectorTest, MessageWithHandles) {
   // |smph| now owns this handle.
 
   internal::Connector connector_received(smph.Pass());
-  internal::Connector connector_original(handles[1].Pass());
+  internal::Connector connector_original(pipe.handle1.Pass());
 
   Message message2;
   AllocMessage(kText, &message2);