WTF::notFound looks too much like a local variable.

Source/core/html/track/TextTrackCue.cpp

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2011, 2012, 2013 Apple 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.
@@ skipping 913 matching lines @@
         // When the user agent is to parse the WebVTT settings given by a string input for a text track cue cue,
         // the user agent must run the following steps:
         // 1. Let settings be the result of splitting input on spaces.
         // 2. For each token setting in the list settings, run the following substeps:
         //    1. If setting does not contain a U+003A COLON character (:), or if the first U+003A COLON character (:)
         //       in setting is either the first or last character of setting, then jump to the step labeled next setting.
         unsigned endOfSetting = position;
         String setting = WebVTTParser::collectWord(input, &endOfSetting);
         CueSetting name;
         size_t colonOffset = setting.find(':', 1);
-        if (colonOffset == notFound || colonOffset == 0 || colonOffset == setting.length() - 1)
+        if (colonOffset == kNotFound || !colonOffset || colonOffset == setting.length() - 1)
             goto NextSetting;
 
         // 2. Let name be the leading substring of setting up to and excluding the first U+003A COLON character (:) in that string.
         name = settingName(setting.substring(0, colonOffset));
 
         // 3. Let value be the trailing substring of setting starting from the character immediately after the first U+003A COLON character (:) in that string.
         position += colonOffset + 1;
         if (position >= input.length())
             break;
 
@@ skipping 26 matching lines @@
             if (position < input.length() && !WebVTTParser::isValidSettingDelimiter(input[position]))
                 break;
 
             // 2. If value does not contain at least one character in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT
             //    NINE (9), then jump to the step labeled next setting.
             // 3. If any character in value other than the first character is a U+002D HYPHEN-MINUS character (-), then
             //    jump to the step labeled next setting.
             // 4. If any character in value other than the last character is a U+0025 PERCENT SIGN character (%), then
             //    jump to the step labeled next setting.
             String linePosition = linePositionBuilder.toString();
-            if (linePosition.find('-', 1) != notFound || linePosition.reverseFind("%", linePosition.length() - 2) != notFound)
+            if (linePosition.find('-', 1) != kNotFound || linePosition.reverseFind("%", linePosition.length() - 2) != kNotFound)
                 break;
 
             // 5. If the first character in value is a U+002D HYPHEN-MINUS character (-) and the last character in value is a
             //    U+0025 PERCENT SIGN character (%), then jump to the step labeled next setting.
             if (linePosition[0] == '-' && linePosition[linePosition.length() - 1] == '%')
                 break;
 
             // 6. Ignoring the trailing percent sign, if any, interpret value as a (potentially signed) integer, and
             //    let number be that number.
             // NOTE: toInt ignores trailing non-digit characters, such as '%'.
@@ skipping 192 matching lines @@
         return false;
     if (m_cueSize != cue.size())
         return false;
     if (align() != cue.align())
         return false;
 
     return true;
 }
 
 } // namespace WebCore