Attempt at fixing crash where compositor is null

ui/views/win/hwnd_message_handler.cc

 // Copyright (c) 2012 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.
 
 #include "ui/views/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <oleacc.h>
 #include <shellapi.h>
 #include <wtsapi32.h>
@@ skipping 893 matching lines @@
     return 0;
   msg_handled_ = old_msg_handled;
 
   if (!processed)
     result = DefWindowProc(window, message, w_param, l_param);
 
   // DefWindowProc() may have destroyed the window in a nested message loop.
   if (!::IsWindow(window))
     return result;
 
-  if (delegate_)
+  if (delegate_) {
     delegate_->PostHandleMSG(message, w_param, l_param);
-  if (message == WM_NCDESTROY) {
-    if (delegate_)
+    if (message == WM_NCDESTROY)
       delegate_->HandleDestroyed();
   }
 
   if (message == WM_ACTIVATE && IsTopLevelWindow(window))
     PostProcessActivateMessage(LOWORD(w_param), !!HIWORD(w_param));
   return result;
 }
 
 LRESULT HWNDMessageHandler::HandleMouseMessage(unsigned int message,
                                                WPARAM w_param,
@@ skipping 1480 matching lines @@
     POINT cursor_pos = {0};
     ::GetCursorPos(&cursor_pos);
     if (memcmp(&cursor_pos, &mouse_location, sizeof(POINT)))
       return false;
     return true;
   }
   return false;
 }
 
 }  // namespace views