Revert the latest set of platform changes.

src/d8-debug.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 35 matching lines @@
 class RemoteDebuggerEvent;
 class ReceiverThread;
 
 
 // Remote debugging class.
 class RemoteDebugger {
  public:
   explicit RemoteDebugger(Isolate* isolate, int port)
       : isolate_(isolate),
         port_(port),
+        event_access_(i::OS::CreateMutex()),
         event_available_(i::OS::CreateSemaphore(0)),
         head_(NULL), tail_(NULL) {}
   void Run();
 
   // Handle events from the subordinate threads.
   void MessageReceived(i::SmartArrayPointer<char> message);
   void KeyboardCommand(i::SmartArrayPointer<char> command);
   void ConnectionClosed();
 
  private:
@@ skipping 10 matching lines @@
   // Get connection to agent in debugged V8.
   i::Socket* conn() { return conn_; }
 
   Isolate* isolate_;
   int port_;  // Port used to connect to debugger V8.
   i::Socket* conn_;  // Connection to debugger agent in debugged V8.
 
   // Linked list of events from debugged V8 and from keyboard input. Access to
   // the list is guarded by a mutex and a semaphore signals new items in the
   // list.
-  i::Mutex event_access_;
+  i::Mutex* event_access_;
   i::Semaphore* event_available_;
   RemoteDebuggerEvent* head_;
   RemoteDebuggerEvent* tail_;
 
   friend class ReceiverThread;
 };
 
 
 // Thread reading from debugged V8 instance.
 class ReceiverThread: public i::Thread {
@@ skipping 49 matching lines @@
   RemoteDebuggerEvent* next_;
 
   friend class RemoteDebugger;
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_DEBUG_H_