[fsp] Remove the create flag from the file opening operation.

chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 60 matching lines @@
   // or a directory.
   virtual void GetMetadata(const base::FilePath& entry_path,
                            const GetMetadataCallback& callback) = 0;
 
   // Requests enumerating entries from the passed |directory_path|. The callback
   // can be called multiple times until |has_more| is set to false.
   virtual void ReadDirectory(
       const base::FilePath& directory_path,
       const fileapi::AsyncFileUtil::ReadDirectoryCallback& callback) = 0;
 
-  // Requests opening a file at |file_path|. If |create| is set to true, it will
-  // create a file and return success in case it didn't exist.
+  // Requests opening a file at |file_path|. If the file doesn't exist, then the
+  // operation will fail.
   virtual void OpenFile(const base::FilePath& file_path,
                         OpenFileMode mode,
-                        bool create,
                         const OpenFileCallback& callback) = 0;
 
   // Requests closing a file, previously opened with OpenFile() as a file with
   // |file_handle|. For either succes or error |callback| must be called.
   virtual void CloseFile(
       int file_handle,
       const fileapi::AsyncFileUtil::StatusCallback& callback) = 0;
 
   // Requests reading a file previously opened with |file_handle|. The callback
   // can be called multiple times until |has_more| is set to false. On success
@@ skipping 12 matching lines @@
   virtual RequestManager* GetRequestManager() = 0;
 
   // Returns a weak pointer to this object.
   virtual base::WeakPtr<ProvidedFileSystemInterface> GetWeakPtr() = 0;
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_