Remove DrivePrefetcher and relevant flags.

chrome/browser/chromeos/drive/drive_prefetcher.h

Index: chrome/browser/chromeos/drive/drive_prefetcher.h
diff --git a/chrome/browser/chromeos/drive/drive_prefetcher.h b/chrome/browser/chromeos/drive/drive_prefetcher.h
deleted file mode 100644
index 7ca7021bede00f9605050c7c4d233bff00285fb1..0000000000000000000000000000000000000000
--- a/chrome/browser/chromeos/drive/drive_prefetcher.h
+++ /dev/null
@@ -1,101 +0,0 @@
-// 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_PREFETCHER_H_
-#define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_PREFETCHER_H_
-
-#include <set>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "chrome/browser/chromeos/drive/drive.pb.h"
-#include "chrome/browser/chromeos/drive/drive_file_system_interface.h"
-#include "chrome/browser/chromeos/drive/file_system_observer.h"
-
-namespace base {
-class FilePath;
-}
-
-namespace drive {
-
-// The parameters for DrivePrefetcher construction.
-struct DrivePrefetcherOptions {
-  DrivePrefetcherOptions();  // Sets the default values.
-
-  int initial_prefetch_count;
-  int64 prefetch_file_size_limit;
-};
-
-// DrivePrefetcher is used to observe and scan the Drive file system for
-// maintaining the prioritized list of files to prefetch into the cache.
-//
-// All the methods (including ctor and dtor) must be called from UI thread.
-class DrivePrefetcher : public FileSystemObserver {
- public:
-  DrivePrefetcher(DriveFileSystemInterface* file_system,
-                  const DrivePrefetcherOptions& options);
-  virtual ~DrivePrefetcher();
-
-  // FileSystemObserver overrides.
-  virtual void OnInitialLoadFinished() OVERRIDE;
-  virtual void OnDirectoryChanged(
-      const base::FilePath& directory_path) OVERRIDE;
-
- private:
-  // Scans the file system and calls DoPrefetch().
-  void StartPrefetcherCycle();
-
-  // Fetches the file with the highest prefetch priority. If prefetching is
-  // currently suspended, do nothing.
-  void DoPrefetch();
-
-  // Called when DoPrefetch is done.
-  void OnPrefetchFinished(const std::string& resource_id,
-                          FileError error,
-                          const base::FilePath& file_path,
-                          const std::string& mime_type,
-                          DriveFileType file_type);
-
-  // Creates the |queue_| from the list of files with |latest_| timestamps.
-  void ReconstructQueue();
-
-  // Helper methods to traverse over the file system.
-  void VisitFile(const DriveEntryProto& entry);
-  void VisitDirectory(const base::FilePath& directory_path);
-  void OnReadDirectory(const base::FilePath& directory_path,
-                       FileError error,
-                       bool hide_hosted_documents,
-                       scoped_ptr<DriveEntryProtoVector> entries);
-  void OnReadDirectoryFinished();
-
-  // Keeps the kNumberOfLatestFilesToKeepInCache latest files in the filesystem.
-  typedef bool (*PrefetchPriorityComparator)(const DriveEntryProto&,
-                                             const DriveEntryProto&);
-  typedef std::set<DriveEntryProto, PrefetchPriorityComparator> LatestFileSet;
-  LatestFileSet latest_files_;
-
-  // Number of in-flight |VisitDirectory| calls that has not finished yet.
-  int number_of_inflight_traversals_;
-
-  // Number of files to put into prefetch queue
-  int initial_prefetch_count_;
-
-  // The maximum file size for prefetched files. Files larger than the limit is
-  // ignored from the prefetcher.
-  int64 prefetch_file_size_limit_;
-
-  // File system is owned by DriveSystemService.
-  DriveFileSystemInterface* file_system_;
-
-  // Note: This should remain the last member so it'll be destroyed and
-  // invalidate its weak pointers before any other members are destroyed.
-  base::WeakPtrFactory<DrivePrefetcher> weak_ptr_factory_;
-  DISALLOW_COPY_AND_ASSIGN(DrivePrefetcher);
-};
-
-}  // namespace drive
-
-#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_PREFETCHER_H_