Remove DOM prefix from several IDL interfaces

Source/core/html/FormData.idl

 /*
  * Copyright (C) 2010 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 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
     CustomConstructor(optional HTMLFormElement form),
-    InterfaceName=FormData,
+    ImplementedAs=DOMFormData,
     ImplementationLacksVTable
-] interface DOMFormData {
+] interface FormData {
     // void append(DOMString name, DOMString value);
     // void append(DOMString name, Blob value, optional DOMString filename);
     [Custom] void append([Default=Undefined] optional DOMString name, 
                          [Default=Undefined] optional DOMString value,
                          [Default=Undefined] optional DOMString filename);
 };