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

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index f7fa25fdcd28b14cfbb0b98be5e5ef04b32720fa..ec074ba3be43328eb986ae4bc273626aefc13f84 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -194,16 +194,6 @@ static bool canLoadURL(const KURL& url, const ContentType& contentType, const St
     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.