Move FileEnumerator to its own file, do some refactoring.

chrome/browser/chromeos/camera_detector.cc

 // Copyright (c) 2012 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 "chrome/browser/chromeos/camera_detector.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/location.h"
 #include "base/string_util.h"
 #include "base/strings/string_split.h"
 #include "base/task_runner_util.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/storage_monitor/udev_util_linux.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace chromeos {
 
@@ skipping 40 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   camera_presence_ = present ? kCameraPresent : kCameraAbsent;
   presence_check_in_progress_ = false;
   callback.Run();
 }
 
 // static
 bool CameraDetector::CheckPresence() {
   // We do a quick check using udev database because opening each /dev/videoX
   // device may trigger costly device initialization.
-  using file_util::FileEnumerator;
-  FileEnumerator file_enum(
+  base::FileEnumerator file_enum(
       base::FilePath(kV4LSubsystemDir), false /* not recursive */,
-      FileEnumerator::FILES | FileEnumerator::SHOW_SYM_LINKS);
+      base::FileEnumerator::FILES | base::FileEnumerator::SHOW_SYM_LINKS);
   for (base::FilePath path = file_enum.Next(); !path.empty();
        path = file_enum.Next()) {
     std::string v4l_capabilities;
     if (chrome::GetUdevDevicePropertyValueByPath(
             path, kV4LCapabilities, &v4l_capabilities)) {
       std::vector<std::string> caps;
       base::SplitString(v4l_capabilities, kV4LCapabilitiesDelim, &caps);
       if (find(caps.begin(), caps.end(), kV4LCaptureCapability) != caps.end()) {
         return true;
       }
     }
   }
   return false;
 }
 
 }  // namespace chromeos