Improve a poor implementation of "find duplicates".

content/child/webcrypto/test/test_helpers.h

 // 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.
 
 #ifndef CONTENT_CHILD_WEBCRYPTO_TEST_TEST_HELPERS_H_
 #define CONTENT_CHILD_WEBCRYPTO_TEST_TEST_HELPERS_H_
 
 #include <ostream>
 #include <string>
 #include <vector>
@@ skipping 80 matching lines @@
 // Returns empty vector on failure.
 std::vector<uint8_t> GetBytesFromHexString(base::DictionaryValue* dict,
                                            const char* property_name);
 
 // Reads a string property with path "property_name" and converts it to a
 // WebCryptoAlgorith. Returns null algorithm on failure.
 blink::WebCryptoAlgorithm GetDigestAlgorithm(base::DictionaryValue* dict,
                                              const char* property_name);
 
 // Returns true if any of the vectors in the input list have identical content.
-// Dumb O(n^2) implementation but should be fast enough for the input sizes that
-// are used.
 bool CopiesExist(const std::vector<std::vector<uint8_t> >& bufs);
 
 blink::WebCryptoAlgorithm CreateAesKeyGenAlgorithm(
     blink::WebCryptoAlgorithmId aes_alg_id,
     unsigned short length);
 
 // The following key pair is comprised of the SPKI (public key) and PKCS#8
 // (private key) representations of the key pair provided in Example 1 of the
 // NIST test vectors at
 // ftp://ftp.rsa.com/pub/rsalabs/tmp/pkcs1v15sign-vectors.txt
@@ skipping 57 matching lines @@
     int key_len_bits,
     const blink::WebCryptoAlgorithm& import_algorithm,
     blink::WebCryptoKeyUsageMask usages,
     const std::string& jwk_alg);
 
 }  // namespace webcrypto
 
 }  // namesapce content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_TEST_TEST_HELPERS_H_