Use ScopedTaskEnvironment instead of MessageLoop in components unit tests.

components/nacl/loader/nacl_ipc_adapter_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/nacl/loader/nacl_ipc_adapter.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
 
 #include <memory>
 
 #include "base/run_loop.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/simple_thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ipc/ipc_test_sink.h"
 #include "native_client/src/public/nacl_desc_custom.h"
 #include "native_client/src/trusted/service_runtime/include/sys/fcntl.h"
 #include "ppapi/c/ppb_file_io.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ skipping 27 matching lines @@
     NaClImcTypedMsgHdr msg = {&iov, 1};
     return adapter_->BlockingReceive(&msg);
   }
 
   int Send(void* buf, size_t buf_size) {
     NaClImcMsgIoVec iov = {buf, buf_size};
     NaClImcTypedMsgHdr msg = {&iov, 1};
     return adapter_->Send(&msg);
   }
 
-  base::MessageLoop message_loop_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
 
   scoped_refptr<NaClIPCAdapter> adapter_;
 
   // Messages sent from nacl to the adapter end up here. Note that we create
   // this pointer and pass ownership of it to the IPC adapter, who will keep
   // it alive as long as the adapter is alive. This means that when the
   // adapter goes away, this pointer will become invalid.
   //
   // In real life the adapter needs to take ownership so the channel can be
   // destroyed on the right thread.
@@ skipping 279 matching lines @@
   EXPECT_EQ(NACL_ABI_O_RDONLY,
       TranslatePepperFileReadWriteOpenFlagsForTesting(
           PP_FILEOPENFLAG_CREATE));
   EXPECT_EQ(NACL_ABI_O_RDONLY,
       TranslatePepperFileReadWriteOpenFlagsForTesting(
           PP_FILEOPENFLAG_TRUNCATE));
   EXPECT_EQ(NACL_ABI_O_RDONLY,
       TranslatePepperFileReadWriteOpenFlagsForTesting(
           PP_FILEOPENFLAG_EXCLUSIVE));
 }