Make mojo::RunLoop just use pthreads.

mojo/public/cpp/environment/lib/environment.cc

 // Copyright 2014 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 "mojo/public/cpp/environment/environment.h"
 
 #include <assert.h>
 
 #include "mojo/public/c/environment/logger.h"
 #include "mojo/public/cpp/environment/lib/default_async_waiter.h"
 #include "mojo/public/cpp/environment/lib/default_logger.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 
 namespace mojo {
 
 namespace {
 
 const MojoAsyncWaiter* g_default_async_waiter = nullptr;
 const MojoLogger* g_default_logger = nullptr;
 
 void Init(const MojoAsyncWaiter* default_async_waiter,
           const MojoLogger* default_logger) {
   g_default_async_waiter = default_async_waiter
                                ? default_async_waiter
                                : &internal::kDefaultAsyncWaiter;
   g_default_logger =
       default_logger ? default_logger : &internal::kDefaultLogger;
-
-  RunLoop::SetUp();
 }
 
 }  // namespace
 
 Environment::Environment() {
   Init(nullptr, nullptr);
 }
 
 Environment::Environment(const MojoAsyncWaiter* default_async_waiter,
                          const MojoLogger* default_logger) {
   Init(default_async_waiter, default_logger);
 }
 
 Environment::~Environment() {
-  RunLoop::TearDown();
-
   // TODO(vtl): Maybe we should allow nesting, and restore previous default
   // async waiters and loggers?
   g_default_async_waiter = nullptr;
   g_default_logger = nullptr;
 }
 
 // static
 const MojoAsyncWaiter* Environment::GetDefaultAsyncWaiter() {
   assert(g_default_async_waiter);  // Fails if not "inside" |Environment|.
   return g_default_async_waiter;
@@ skipping 21 matching lines @@
 }
 
 // static
 void Environment::DestroyDefaultRunLoop() {
   assert(RunLoop::current());
   delete RunLoop::current();
   assert(!RunLoop::current());
 }
 
 }  // namespace mojo