Add multiplexing of message pipes in the new EDK.

mojo/edk/system/message_pipe_test_utils.cc

Index: mojo/edk/system/message_pipe_test_utils.cc
diff --git a/mojo/edk/system/message_pipe_test_utils.cc b/mojo/edk/system/message_pipe_test_utils.cc
index 1e337fbcdcc89a87c7afea545c673d8ae84470e3..c752abcfd278286c84e39b41610b1040ae965c50 100644
--- a/mojo/edk/system/message_pipe_test_utils.cc
+++ b/mojo/edk/system/message_pipe_test_utils.cc
@@ -11,16 +11,7 @@ namespace edk {
 namespace test {
 
 #if !defined(OS_IOS)
-MultiprocessMessagePipeTestBase::MultiprocessMessagePipeTestBase()
-    : test_io_thread_(base::TestIOThread::kAutoStart),
-      ipc_support_(test_io_thread_.task_runner()) {
-}
-
-MultiprocessMessagePipeTestBase::MultiprocessMessagePipeTestBase(
-    base::MessageLoop::Type main_message_loop_type)
-    : message_loop_(main_message_loop_type),
-      test_io_thread_(base::TestIOThread::kAutoStart),
-      ipc_support_(test_io_thread_.task_runner()) {
+MultiprocessMessagePipeTestBase::MultiprocessMessagePipeTestBase() {
 }
 
 MultiprocessMessagePipeTestBase::~MultiprocessMessagePipeTestBase() {