LocalFileSystem::deleteFileSystem() is no longer used.

content/child/fileapi/webfilesystem_impl.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 CONTENT_CHILD_FILEAPI_WEBFILESYSTEM_IMPL_H_
 #define CONTENT_CHILD_FILEAPI_WEBFILESYSTEM_IMPL_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
@@ skipping 39 matching lines @@
 
   // WorkerThread::Observer implementation.
   void WillStopCurrentWorkerThread() override;
 
   // WebFileSystem implementation.
   void openFileSystem(const blink::WebURL& storage_partition,
                       const blink::WebFileSystemType type,
                       blink::WebFileSystemCallbacks) override;
   void resolveURL(const blink::WebURL& filesystem_url,
                   blink::WebFileSystemCallbacks) override;
-  void deleteFileSystem(const blink::WebURL& storage_partition,
-                        const blink::WebFileSystemType type,
-                        blink::WebFileSystemCallbacks) override;
   void move(const blink::WebURL& src_path,
             const blink::WebURL& dest_path,
             blink::WebFileSystemCallbacks) override;
   void copy(const blink::WebURL& src_path,
             const blink::WebURL& dest_path,
             blink::WebFileSystemCallbacks) override;
   void remove(const blink::WebURL& path,
               blink::WebFileSystemCallbacks) override;
   void removeRecursively(const blink::WebURL& path,
                          blink::WebFileSystemCallbacks) override;
@@ skipping 36 matching lines @@
   CallbacksMap callbacks_;
   int next_callbacks_id_;
   WaitableCallbackResultsMap waitable_results_;
 
   DISALLOW_COPY_AND_ASSIGN(WebFileSystemImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_FILEAPI_WEBFILESYSTEM_IMPL_H_