Move implementation from header to source.

base/message_loop.h

 // Copyright (c) 2006-2008 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_H_
 #define BASE_MESSAGE_LOOP_H_
 
 #include <queue>
 #include <string>
 
@@ skipping 47 matching lines @@
 // are stable and accessible before calling SetNestableTasksAllowed(true).
 //
 class MessageLoop : public base::MessagePump::Delegate {
  public:
   // A TaskObserver is an object that receives task notifications from the
   // MessageLoop.
   //
   // NOTE: A TaskObserver implementation should be extremely fast!
   class TaskObserver {
    public:
-    TaskObserver() {}
+    TaskObserver();
 
     // This method is called before processing a task.
     virtual void WillProcessTask(base::TimeTicks birth_time) = 0;
 
     // This method is called after processing a task.
     virtual void DidProcessTask() = 0;
 
    protected:
-    virtual ~TaskObserver() {}
+    virtual ~TaskObserver();
   };
 
   static void EnableHistogrammer(bool enable_histogrammer);
 
   // A DestructionObserver is notified when the current MessageLoop is being
   // destroyed.  These obsevers are notified prior to MessageLoop::current()
   // being changed to return NULL.  This gives interested parties the chance to
   // do final cleanup that depends on the MessageLoop.
   //
   // NOTE: Any tasks posted to the MessageLoop during this notification will
   // not be run.  Instead, they will be deleted.
   //
   class DestructionObserver {
    public:
-    virtual ~DestructionObserver() {}
+    virtual ~DestructionObserver();
     virtual void WillDestroyCurrentMessageLoop() = 0;
   };
 
   // Add a DestructionObserver, which will start receiving notifications
   // immediately.
   void AddDestructionObserver(DestructionObserver* destruction_observer);
 
   // Remove a DestructionObserver.  It is safe to call this method while a
   // DestructionObserver is receiving a notification callback.
   void RemoveDestructionObserver(DestructionObserver* destruction_observer);
@@ skipping 492 matching lines @@
 #endif  // defined(OS_POSIX)
 };
 
 // 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);
 
 #endif  // BASE_MESSAGE_LOOP_H_