Replace ASSERT with DCHECK in core/

third_party/WebKit/Source/core/page/PagePopupSupplement.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 46 matching lines @@
   return controller_;
 }
 
 void PagePopupSupplement::Dispose() {
   controller_->ClearPagePopupClient();
 }
 
 void PagePopupSupplement::Install(LocalFrame& frame,
                                   PagePopup& popup,
                                   PagePopupClient* popup_client) {
-  ASSERT(popup_client);
+  DCHECK(popup_client);
   ProvideTo(frame, SupplementName(),
             new PagePopupSupplement(frame, popup, popup_client));
 }
 
 void PagePopupSupplement::Uninstall(LocalFrame& frame) {
   PagePopupSupplement::From(frame).Dispose();
   frame.RemoveSupplement(SupplementName());
 }
 
 DEFINE_TRACE(PagePopupSupplement) {
   visitor->Trace(controller_);
   Supplement<LocalFrame>::Trace(visitor);
 }
 
 }  // namespace blink