Revert 245226 "Nukes MessageLoop::Dispatcher"

trunk/src/base/message_loop/message_loop.h

Index: trunk/src/base/message_loop/message_loop.h
===================================================================
--- trunk/src/base/message_loop/message_loop.h	(revision 245238)
+++ trunk/src/base/message_loop/message_loop.h	(working copy)
@@ -25,8 +25,9 @@
 #include "base/time/time.h"
 #include "base/tracking_info.h"
 
-// TODO(sky): these includes should not be necessary. Nuke them.
 #if defined(OS_WIN)
+// We need this to declare base::MessagePumpWin::Dispatcher, which we should
+// really just eliminate.
 #include "base/message_loop/message_pump_win.h"
 #elif defined(OS_IOS)
 #include "base/message_loop/message_pump_io_ios.h"
@@ -52,6 +53,7 @@
 namespace base {
 
 class HistogramBase;
+class MessagePumpDispatcher;
 class MessagePumpObserver;
 class RunLoop;
 class ThreadTaskRunnerHandle;
@@ -95,6 +97,7 @@
  public:
 
 #if defined(USE_AURA)
+  typedef MessagePumpDispatcher Dispatcher;
   typedef MessagePumpObserver Observer;
 #elif defined(USE_GTK_MESSAGE_PUMP)
   typedef MessagePumpGdkObserver Observer;