Rename NavigatorCPU mixin to NavigatorConcurrentHardware to match spec

third_party/WebKit/Source/core/frame/NavigatorConcurrentHardware.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://wiki.whatwg.org/wiki/Navigator_HW_Concurrency
+// https://html.spec.whatwg.org/multipage/workers.html#navigator.hardwareconcurrency
 
 [
     NoInterfaceObject,
     Exposed=(Window,Worker),
-] interface NavigatorCPU {
-    readonly attribute unsigned long hardwareConcurrency;
+] interface NavigatorConcurrentHardware {
+    readonly attribute unsigned long long hardwareConcurrency;
 };