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

Source/core/platform/chromium/MIMETypeRegistryChromium.cpp

 /*
  * Copyright (c) 2008, 2009, 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 117 matching lines @@
 {
     // Since this set is very limited and is likely to remain so we won't bother with the overhead
     // of using a hash set.
     // Any of the MIME types below may be followed by any number of specific versions of the JVM,
     // which is why we use startsWith()
     return mimeType.startsWith("application/x-java-applet", false)
         || mimeType.startsWith("application/x-java-bean", false)
         || mimeType.startsWith("application/x-java-vm", false);
 }
 
-String MIMETypeRegistry::getMediaMIMETypeForExtension(const String&)
-{
-    return String();
-}
-
-bool MIMETypeRegistry::isApplicationPluginMIMEType(const String&)
-{
-    return false;
-}
-
-static HashSet<String>& dummyHashSet()
-{
-    ASSERT_NOT_REACHED();
-    DEFINE_STATIC_LOCAL(HashSet<String>, dummy, ());
-    return dummy;
-}
-
-// NOTE: the following methods should never be reached
-HashSet<String>& MIMETypeRegistry::getSupportedImageMIMETypes() { return dummyHashSet(); }
-HashSet<String>& MIMETypeRegistry::getSupportedImageResourceMIMETypes() { return dummyHashSet(); }
-HashSet<String>& MIMETypeRegistry::getSupportedImageMIMETypesForEncoding() { return dummyHashSet(); }
-HashSet<String>& MIMETypeRegistry::getSupportedNonImageMIMETypes() { return dummyHashSet(); }
-HashSet<String>& MIMETypeRegistry::getSupportedMediaMIMETypes() { return dummyHashSet(); }
-
 } // namespace WebCore