base: Remove now-unused MessagePumpObserver.

base/message_loop/message_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 BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 20 matching lines @@
 #include "base/message_loop/message_pump_win.h"
 #elif defined(OS_IOS)
 #include "base/message_loop/message_pump_io_ios.h"
 #elif defined(OS_POSIX)
 #include "base/message_loop/message_pump_libevent.h"
 #endif
 
 namespace base {
 
 class HistogramBase;
-class MessagePumpObserver;
 class RunLoop;
 class ThreadTaskRunnerHandle;
 class WaitableEvent;
 
 // A MessageLoop is used to process events for a particular thread.  There is
 // at most one MessageLoop instance per thread.
 //
 // Events include at a minimum Task instances submitted to PostTask and its
 // variants.  Depending on the type of message pump used by the MessageLoop
 // other events such as UI messages may be processed.  On Windows APC calls (as
@@ skipping 492 matching lines @@
   void Attach();
 #endif
 
 #if defined(OS_ANDROID)
   // On Android, the UI message loop is handled by Java side. So Run() should
   // never be called. Instead use Start(), which will forward all the native UI
   // events to the Java message loop.
   void Start();
 #endif
 
-#if defined(OS_WIN)
-  typedef MessagePumpObserver Observer;
-
-  // Please see message_pump_win for definitions of these methods.
-  void AddObserver(Observer* observer);
-  void RemoveObserver(Observer* observer);
-#endif
-
 #if defined(USE_OZONE) || (defined(USE_X11) && !defined(USE_GLIB))
   // Please see MessagePumpLibevent for definition.
   bool WatchFileDescriptor(
       int fd,
       bool persistent,
       MessagePumpLibevent::Mode mode,
       MessagePumpLibevent::FileDescriptorWatcher* controller,
       MessagePumpLibevent::Watcher* delegate);
 #endif
 };
@@ skipping 81 matching lines @@
 
 // Do not add any member variables to MessageLoopForIO!  This is important b/c
 // MessageLoopForIO is often allocated via MessageLoop(TYPE_IO).  Any extra
 // data that you need should be stored on the MessageLoop's pump_ instance.
 COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
                MessageLoopForIO_should_not_have_extra_member_variables);
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_