Moved SuperFastHash function from base/hash.cc to base/third_party.

base/hash.h

 // Copyright (c) 2011 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 BASE_HASH_H_
 #define BASE_HASH_H_
 
 #include <string>
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 
 namespace base {
 
-// From http://www.azillionmonkeys.com/qed/hash.html
-// This is the hash used on WebCore/platform/stringhash
-BASE_EXPORT uint32 SuperFastHash(const char * data, int len);
+BASE_EXPORT uint32 SuperFastHash(const char* data, int len);
 
 inline uint32 Hash(const char* key, size_t length) {
   return SuperFastHash(key, static_cast<int>(length));
 }
 
 inline uint32 Hash(const std::string& key) {
   if (key.empty())
     return 0;
   return SuperFastHash(key.data(), static_cast<int>(key.size()));
 }
 
 }  // namespace base
 
 #endif  // BASE_HASH_H_