EDK: Move mutex.*, cond_var.*, and thread_annotations.h to //mojo/edk/util.

mojo/edk/util/cond_var.h

 // Copyright 2015 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.
 
-// A condition variable class (to be used with |mojo::system::Mutex|).
+// A condition variable class (to be used with |mojo::util::Mutex|).
 
-#ifndef MOJO_EDK_SYSTEM_COND_VAR_H_
-#define MOJO_EDK_SYSTEM_COND_VAR_H_
+#ifndef MOJO_EDK_UTIL_COND_VAR_H_
+#define MOJO_EDK_UTIL_COND_VAR_H_
 
 #include <pthread.h>
 #include <stdint.h>
 
-#include "mojo/edk/system/thread_annotations.h"
+#include "mojo/edk/util/thread_annotations.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
-namespace system {
+namespace util {
 
 class Mutex;
 
 class CondVar {
  public:
   CondVar();
   ~CondVar();
 
   // Atomically releases |*mutex| (which must be held) and blocks on this
   // condition variable, unlocking and reacquiring |*mutex| when:
@@ skipping 25 matching lines @@
 
   // Signals this condition variable, waking all waiting threads.
   void SignalAll();
 
  private:
   pthread_cond_t impl_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(CondVar);
 };
 
-}  // namespace system
+}  // namespace util
 }  // namespace mojo
 
-#endif  // MOJO_EDK_SYSTEM_COND_VAR_H_
+#endif  // MOJO_EDK_UTIL_COND_VAR_H_