Update all float attributes in HTMLMediaElement and related objects to double

Source/WebCore/html/TimeRanges.idl

 /*
  * Copyright (C) 2007, 2010 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 10 matching lines @@
  * 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. 
  */
 
 [
     Conditional=VIDEO,
     ImplementationLacksVTable
 ] interface TimeRanges {
     readonly attribute unsigned long length;
-    float start(in unsigned long index)
+    double start(in unsigned long index)
         raises (DOMException);
-    float end(in unsigned long index)
+    double end(in unsigned long index)
         raises (DOMException);
 };