Revert 247926 "HID backend"

trunk/src/device/hid/hid_utils_mac.cc

-// 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.
-
-#include "device/hid/hid_utils_mac.h"
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-#include "base/mac/foundation_util.h"
-#include "base/strings/sys_string_conversions.h"
-
-#if defined(OS_MACOSX)
-#include <CoreFoundation/CoreFoundation.h>
-#include <IOKit/hid/IOHIDManager.h>
-#endif
-
-namespace device {
-
-bool GetHidIntProperty(IOHIDDeviceRef device,
-                       CFStringRef key,
-                       int32_t* result) {
-  CFNumberRef ref = base::mac::CFCast<CFNumberRef>(
-      IOHIDDeviceGetProperty(device, key));
-  return ref && CFNumberGetValue(ref, kCFNumberSInt32Type, result);
-}
-
-bool GetHidStringProperty(IOHIDDeviceRef device,
-                          CFStringRef key,
-                          std::string* result) {
-  CFStringRef ref = base::mac::CFCast<CFStringRef>(
-      IOHIDDeviceGetProperty(device, key));
-  if (!ref) {
-    return false;
-  }
-  *result = base::SysCFStringRefToUTF8(ref);
-  return true;
-}
-
-}  // namespace device