Linux: Dynamically load libudev.

components/storage_monitor/udev_util_linux.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 "components/storage_monitor/udev_util_linux.h"
 
 #include "base/files/file_path.h"
 #include "device/udev_linux/scoped_udev.h"
 
 namespace storage_monitor {
 
 std::string GetUdevDevicePropertyValue(udev_device* udev_device,
                                        const char* key) {
-  const char* value = udev_device_get_property_value(udev_device, key);
+  const char* value = device::udev_device_get_property_value(udev_device, key);
   return value ? value : std::string();
 }
 
 bool GetUdevDevicePropertyValueByPath(const base::FilePath& device_path,
                                       const char* key,
                                       std::string* result) {
-  device::ScopedUdevPtr udev(udev_new());
+  device::ScopedUdevPtr udev(device::udev_new());
   if (!udev.get())
     return false;
-  device::ScopedUdevDevicePtr device(udev_device_new_from_syspath(
+  device::ScopedUdevDevicePtr device(device::udev_device_new_from_syspath(
       udev.get(), device_path.value().c_str()));
   if (!device.get())
     return false;
   *result = GetUdevDevicePropertyValue(device.get(), key);
   return true;
 }
 
 }  // namespace storage_monitor