Replace ASSERT()s with DCHECK*() in core/html/*.{cpp,h}.

third_party/WebKit/Source/core/html/MediaDocument.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 106 matching lines @@
             recordDownloadMetric(MediaDocumentDownloadButtonClicked);
             m_clicked = true;
         }
     }
 
     bool m_clicked;
 };
 
 void MediaDocumentParser::createDocumentStructure()
 {
-    ASSERT(document());
+    DCHECK(document());
     HTMLHtmlElement* rootElement = HTMLHtmlElement::create(*document());
     document()->appendChild(rootElement);
     rootElement->insertedByParser();
 
     if (isDetached())
         return; // runScriptsAtDocumentElementAvailable can detach the frame.
 
     HTMLHeadElement* head = HTMLHeadElement::create(*document());
     HTMLMetaElement* meta = HTMLMetaElement::create(*document());
     meta->setAttribute(nameAttr, "viewport");
@@ skipping 118 matching lines @@
         KeyboardEvent* keyboardEvent = toKeyboardEvent(event);
         if (keyboardEvent->key() == " " || keyboardEvent->keyCode() == VKEY_MEDIA_PLAY_PAUSE) {
             // space or media key (play/pause)
             video->togglePlayState();
             event->setDefaultHandled();
         }
     }
 }
 
 } // namespace blink