Remove unused, unimplemented and no-op methods from MIMETypeRegistry.

Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 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 176 matching lines @@
 {
     DEFINE_STATIC_LOCAL(const String, codecs, (ASCIILiteral("codecs")));
 
     String contentMIMEType = contentType.type().lower();
     String contentTypeCodecs = contentType.parameter(codecs);
 
     // If the MIME type is missing or is not meaningful, try to figure it out from the URL.
     if (contentMIMEType.isEmpty() || contentMIMEType == "application/octet-stream" || contentMIMEType == "text/plain") {
         if (url.protocolIsData())
             contentMIMEType = mimeTypeFromDataURL(url.string());
-        else {
-            String lastPathComponent = url.lastPathComponent();
-            size_t pos = lastPathComponent.reverseFind('.');
-            if (pos != notFound) {
-                String extension = lastPathComponent.substring(pos + 1);
-                String mediaType = MIMETypeRegistry::getMediaMIMETypeForExtension(extension);
-                if (!mediaType.isEmpty())
-                    return true;
-            }
-        }
     }
 
     // If no MIME type is specified, always attempt to load.
     if (contentMIMEType.isEmpty())
         return true;
 
     // 4.8.10.3 MIME types - In the absence of a specification to the contrary, the MIME type "application/octet-stream"
     // when used with parameters, e.g. "application/octet-stream;codecs=theora", is a type that the user agent knows
     // it cannot render.
     if (contentMIMEType != "application/octet-stream" || contentTypeCodecs.isEmpty()) {
@@ skipping 3740 matching lines @@
 {
     m_restrictions = NoRestrictions;
 }
 
 void HTMLMediaElement::mediaPlayerScheduleLayerUpdate()
 {
     scheduleLayerUpdate();
 }
 
 }