Replace base::str[n]casecmp with helper functions.

net/tools/quic/test_tools/http_message.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/test_tools/http_message.h"
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 140 matching lines @@
   if (skip_message_validation_) {
     return;
   }
 
   vector<StringPiece> transfer_encodings;
   headers()->GetAllOfHeader(kTransferCoding, &transfer_encodings);
   CHECK_GE(1ul, transfer_encodings.size());
   for (vector<StringPiece>::iterator it = transfer_encodings.begin();
        it != transfer_encodings.end();
        ++it) {
-    CHECK(StringPieceUtils::EqualIgnoreCase("identity", *it) ||
-          StringPieceUtils::EqualIgnoreCase("chunked", *it)) << *it;
+    CHECK(base::EqualsCaseInsensitiveASCII("identity", *it) ||
+          base::EqualsCaseInsensitiveASCII("chunked", *it)) << *it;
   }
 
   vector<StringPiece> content_lengths;
   headers()->GetAllOfHeader(kContentLength, &content_lengths);
   CHECK_GE(1ul, content_lengths.size());
 
   CHECK_EQ(has_complete_message_, IsCompleteMessage(*this));
 }
 
 }  // namespace test
 }  // namespace tools
 }  // namespace net