Remove CloseFile from FileSystem.

chrome/browser/chromeos/drive/fileapi_worker.h

Index: chrome/browser/chromeos/drive/fileapi_worker.h
diff --git a/chrome/browser/chromeos/drive/fileapi_worker.h b/chrome/browser/chromeos/drive/fileapi_worker.h
index d26c65e0f17c8aac3de64ec18f16099100e6fda5..0e65f125f44e10e13c79c66aeee90101bf573cab 100644
--- a/chrome/browser/chromeos/drive/fileapi_worker.h
+++ b/chrome/browser/chromeos/drive/fileapi_worker.h
@@ -61,11 +61,13 @@ typedef base::Callback<
     CreateSnapshotFileCallback;
 typedef base::Callback<
     void(base::PlatformFileError result,
-         const base::FilePath& snapshot_file_path)>
+         const base::FilePath& snapshot_file_path,
+         const base::Closure& on_close_callback)>
     CreateWritableSnapshotFileCallback;
 typedef base::Callback<
     void(base::PlatformFileError result,
-         base::PlatformFile platform_file)> OpenFileCallback;
+         base::PlatformFile platform_file,
+         const base::Closure& on_close_callback)> OpenFileCallback;
 
 // Runs |file_system_getter| to obtain the instance of FileSystemInstance,
 // and then runs |callback| with it.
@@ -148,7 +150,7 @@ void CreateSnapshotFile(const base::FilePath& file_path,
                         FileSystemInterface* file_system);
 
 // Creates a writable snapshot for the file at |file_path|.
-// After writing operation is done, CloseFile is needed to be called.
+// After writing operation is done, |on_close_callback| must be called.
 void CreateWritableSnapshotFile(
     const base::FilePath& file_path,
     const CreateWritableSnapshotFileCallback& callback,
@@ -161,12 +163,6 @@ void OpenFile(const base::FilePath& file_path,
               const OpenFileCallback& callback,
               FileSystemInterface* file_system);
 
-// Closes the file at |file_path|.
-// Called from FileSystemProxy::NotifyCloseFile and
-// FileSystemProxy::CloseWRitableSnapshotFile.
-void CloseFile(const base::FilePath& file_path,
-               FileSystemInterface* file_system);
-
 // Changes timestamp of the file at |file_path| to |last_access_time| and
 // |last_modified_time|. Called from FileSystemProxy::TouchFile().
 void TouchFile(const base::FilePath& file_path,