Make mojo::RunLoop just use pthreads.

mojo/public/cpp/utility/run_loop.h

 // 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.
 
 #ifndef MOJO_PUBLIC_CPP_UTILITY_RUN_LOOP_H_
 #define MOJO_PUBLIC_CPP_UTILITY_RUN_LOOP_H_
 
 #include <map>
 #include <queue>
 
 #include "mojo/public/c/system/time.h"
 #include "mojo/public/cpp/bindings/callback.h"
 #include "mojo/public/cpp/system/handle.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "mojo/public/cpp/system/message_pipe.h"
 
 namespace mojo {
 
 class RunLoopHandler;
 
 // Watches handles for signals and calls event handlers when they occur. Also
 // executes delayed tasks. This class should only be used by a single thread.
 class RunLoop {
  public:
   RunLoop();
   ~RunLoop();
 
-  // Sets up state needed for RunLoop. This must be invoked before creating a
-  // RunLoop.
-  static void SetUp();
-
-  // Cleans state created by Setup().
-  static void TearDown();
-
   // Returns the RunLoop for the current thread. Returns null if not yet
   // created.
   static RunLoop* current();
 
   // Registers a RunLoopHandler for the specified handle. It is an error to
   // register more than one handler for a handle, and crashes the process.
   //
   // The handler's OnHandleReady() method is invoked after one of the signals in
   // |handle_signals| occurs. Note that the handler remains registered until
   // explicitly removed or an error occurs.
@@ skipping 104 matching lines @@
   uint64_t next_sequence_number_;
   typedef std::priority_queue<PendingTask> DelayedTaskQueue;
   DelayedTaskQueue delayed_tasks_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(RunLoop);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_UTILITY_RUN_LOOP_H_