Make the Vector copy constructor for mismatched inline sizes explicit.

Source/core/html/track/WebVTTTokenizer.cpp

 /*
  * Copyright (C) 2011 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 65 matching lines @@
 
     UChar cc = m_inputStreamPreprocessor.nextInputCharacter();
 
     // 4.8.10.13.4 WebVTT cue text tokenizer
     switch (m_state) {
     WEBVTT_BEGIN_STATE(DataState) {
         if (cc == '&') {
             m_buffer.append(static_cast<LChar>(cc));
             WEBVTT_ADVANCE_TO(EscapeState);
         } else if (cc == '<') {
+            // FIXME: the explicit Vector conversion copies into a temporary
+            // and is wasteful.
             if (m_token->type() == WebVTTTokenTypes::Uninitialized
-                || vectorEqualsString<UChar>(m_token->characters(), emptyString()))
+                || vectorEqualsString<UChar>(Vector<UChar, 32>(m_token->characters()), emptyString()))
                 WEBVTT_ADVANCE_TO(TagState);
             else
                 return emitAndResumeIn(source, WebVTTTokenizerState::TagState);
         } else if (cc == kEndOfFileMarker)
             return emitEndOfFile(source);
         else {
             bufferCharacter(cc);
             WEBVTT_ADVANCE_TO(DataState);
         }
     }
@@ skipping 119 matching lines @@
     END_STATE()
 
     }
 
     ASSERT_NOT_REACHED();
     return false;
 }
 
 }