[Pepper][FileAPI] Interface clean up (3/6)

webkit/browser/fileapi/quota/open_file_handle_context.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_OPEN_FILE_HANDLE_CONTEXT_H_
 #define WEBKIT_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 11 matching lines @@
 
 // This class represents a underlying file of a managed FileSystem file.
 // The instance keeps alive while at least one consumer keeps an open file
 // handle.
 // This class is usually manipulated only via OpenFileHandle.
 class OpenFileHandleContext : public base::RefCounted<OpenFileHandleContext> {
  public:
   OpenFileHandleContext(const base::FilePath& platform_path,
                         QuotaReservationBuffer* reservation_buffer);
 
-  void UpdateMaxWrittenOffset(int64 offset,
-                              int64* new_file_size,
-                              int64* growth);
+  // Updates the max written offset and returns the amount of growth.
+  int64 UpdateMaxWrittenOffset(int64 offset);
 
   const base::FilePath& platform_path() const {
     return platform_path_;
   }
 
-  int64 base_file_size() const { return maximum_written_offset_; }
+  int64 GetEstimatedFileSize() const;
 
  private:
   friend class base::RefCounted<OpenFileHandleContext>;
   virtual ~OpenFileHandleContext();
 
   int64 initial_file_size_;
   int64 maximum_written_offset_;
   base::FilePath platform_path_;
 
   scoped_refptr<QuotaReservationBuffer> reservation_buffer_;
 
   base::SequenceChecker sequence_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(OpenFileHandleContext);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_BROWSER_FILEAPI_OPEN_FILE_HANDLE_CONTEXT_H_