Simplify state handling in WebVTTTokenizer::nextToken

Source/core/html/track/vtt/VTTToken.h

Index: Source/core/html/track/vtt/VTTToken.h
diff --git a/Source/core/html/track/vtt/VTTToken.h b/Source/core/html/track/vtt/VTTToken.h
index 609f6246127ccf34109e67626e15219ea31b5395..061fc975aefe73d6232f49ad0e22f04c4addb360 100644
--- a/Source/core/html/track/vtt/VTTToken.h
+++ b/Source/core/html/track/vtt/VTTToken.h
@@ -41,7 +41,6 @@ public:
         StartTag,
         EndTag,
         TimestampTag,
-        EndOfFile,
     };
 };
 
@@ -174,12 +173,6 @@ public:
         return m_annotation;
     }
 
-    void makeEndOfFile()
-    {
-        ASSERT(m_type == Type::Uninitialized);
-        m_type = Type::EndOfFile;
-    }
-
     void clear()
     {
         m_type = Type::Uninitialized;