Split file_observers.h into three files for each class

webkit/browser/fileapi/file_change_observer.h

+// Copyright 2013 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 WEBKIT_BROWSER_FILEAPI_FILE_CHANGE_OBSERVER_H_
+#define WEBKIT_BROWSER_FILEAPI_FILE_CHANGE_OBSERVER_H_
+
+namespace fileapi {
+
+class FileSystemURL;
+
+// An abstract interface to observe file changes.
+// Each method of this class is called once per file/directory is created,
+// removed or modified.  For recursive operations each method is called for
+// each subdirectory/subfile.  Currently ChangeObserver is only supported
+// by the local sandbox file system.
+class FileChangeObserver {
+ public:
+  FileChangeObserver() {}
+  virtual ~FileChangeObserver() {}
+
+  virtual void OnCreateFile(const FileSystemURL& url) = 0;
+  virtual void OnCreateFileFrom(const FileSystemURL& url,
+                                const FileSystemURL& src) = 0;
+  virtual void OnRemoveFile(const FileSystemURL& url) = 0;
+  virtual void OnModifyFile(const FileSystemURL& url) = 0;
+
+  virtual void OnCreateDirectory(const FileSystemURL& url) = 0;
+  virtual void OnRemoveDirectory(const FileSystemURL& url) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FileChangeObserver);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_BROWSER_FILEAPI_FILE_CHANGE_OBSERVER_H_