Reduce unnecessary usage of TextCaseSensitivity::TextCaseInsensitive.

third_party/WebKit/Source/platform/mhtml/MHTMLParser.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 42 matching lines @@
     Base64,
     EightBit,
     SevenBit,
     Binary,
     Unknown
   };
 
   static MIMEHeader* parseHeader(SharedBufferChunkReader* crLFLineReader);
 
   bool isMultipart() const {
-    return m_contentType.startsWith("multipart/", TextCaseInsensitive);
+    return m_contentType.startsWith("multipart/", TextCaseASCIIInsensitive);
   }
 
   String contentType() const { return m_contentType; }
   String charset() const { return m_charset; }
   Encoding contentTransferEncoding() const { return m_contentTransferEncoding; }
   String contentLocation() const { return m_contentLocation; }
   String contentID() const { return m_contentID; }
 
   // Multi-part type and boundaries are only valid for multipart MIME headers.
   String multiPartType() const { return m_multipartType; }
@@ skipping 305 matching lines @@
   if (!contentID.startsWith('<') || !contentID.endsWith('>'))
     return KURL();
 
   StringBuilder uriBuilder;
   uriBuilder.append("cid:");
   uriBuilder.append(contentID, 1, contentID.length() - 2);
   return KURL(KURL(), uriBuilder.toString());
 }
 
 }  // namespace blink