Rename ExceptionCode constants to use the names in the spec (2/3)

Source/core/fileapi/FileReader.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 127 matching lines @@
     if (!blob)
         return;
 
     LOG(FileAPI, "FileReader: reading as data URL: %s %s\n", utf8BlobURL(blob).data(), utf8FilePath(blob).data());
 
     readInternal(blob, FileReaderLoader::ReadAsDataURL, ec);
 }
 
 void FileReader::readInternal(Blob* blob, FileReaderLoader::ReadType type, ExceptionCode& ec)
 {
-    // If multiple concurrent read methods are called on the same FileReader, INVALID_STATE_ERR should be thrown when the state is LOADING.
+    // If multiple concurrent read methods are called on the same FileReader, InvalidStateError should be thrown when the state is LOADING.
     if (m_state == LOADING) {
-        ec = INVALID_STATE_ERR;
+        ec = InvalidStateError;
         return;
     }
 
     setPendingActivity(this);
 
     m_blob = blob;
     m_readType = type;
     m_state = LOADING;
     m_error = 0;
 
@@ skipping 110 matching lines @@
 }
 
 String FileReader::stringResult()
 {
     if (!m_loader || m_error)
         return String();
     return m_loader->stringResult();
 }
 
 } // namespace WebCore