Remove FileError interface

third_party/WebKit/Source/modules/filesystem/DOMFileSystemSync.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 168 matching lines @@
     }
 };
 
 class LocalErrorCallback final : public ErrorCallback {
 public:
     static LocalErrorCallback* create(FileError::ErrorCode& errorCode)
     {
         return new LocalErrorCallback(errorCode);
     }
 
+    void handleEvent(DOMException* error) override

[jsbell, 2016/06/03 21:41:58]

This pattern is repeated. I wasn't sure if having an intermediate subclass of
ErrorCallback was worth it, though.

+    {
+        NOTREACHED();
+    }
+
     void handleEvent(FileError* error) override
     {
         ASSERT(error->code() != FileError::OK);
         m_errorCode = error->code();
     }
 
 private:
     explicit LocalErrorCallback(FileError::ErrorCode& errorCode)
         : m_errorCode(errorCode)
     {
@@ skipping 24 matching lines @@
     return fileWriter;
 }
 
 DEFINE_TRACE(DOMFileSystemSync)
 {
     DOMFileSystemBase::trace(visitor);
     visitor->trace(m_rootEntry);
 }
 
 } // namespace blink