Reverting r133134 - Make sure that base::MessagePumpForUI from different modules are isolated from …

base/message_pump_win.h

Index: base/message_pump_win.h
diff --git a/base/message_pump_win.h b/base/message_pump_win.h
index 7514bae253b221728f97e1b0710303d849f3569e..f5a00f3015ecc4a2e61f57e07a44311eb4fdb8ec 100644
--- a/base/message_pump_win.h
+++ b/base/message_pump_win.h
@@ -154,12 +154,6 @@ class BASE_EXPORT MessagePumpForUI : public MessagePumpWin {
   bool ProcessMessageHelper(const MSG& msg);
   bool ProcessPumpReplacementMessage();
 
-  // Atom representing the message-only window class.
-  ATOM atom_;
-
-  // Instance of the module containing the window procedure.
-  HMODULE instance_;
-
   // A hidden message-only window.
   HWND message_hwnd_;
 };