Switch HidDeviceId from IORegistry path to IORegistry entry ID.

device/hid/hid_device_info.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_device_info.h"
 #include "device/hid/hid_report_descriptor.h"
 
 namespace device {
 
+#if !defined(OS_MACOSX)
 const char kInvalidHidDeviceId[] = "";
+#endif
 
 HidDeviceInfo::HidDeviceInfo(const HidDeviceId& device_id,
                              uint16_t vendor_id,
                              uint16_t product_id,
                              const std::string& product_name,
                              const std::string& serial_number,
                              HidBusType bus_type,
                              const std::vector<uint8> report_descriptor)
     : device_id_(device_id),
       vendor_id_(vendor_id),
@@ skipping 27 matching lines @@
       max_input_report_size_(max_input_report_size),
       max_output_report_size_(max_output_report_size),
       max_feature_report_size_(max_feature_report_size) {
   collections_.push_back(collection);
   has_report_id_ = !collection.report_ids.empty();
 }
 
 HidDeviceInfo::~HidDeviceInfo() {}
 
 }  // namespace device