Change SuperFastHash signature to use size_t, not int.

base/hash.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 "base/hash.h"
 
 // Definition in base/third_party/superfasthash/superfasthash.c. (Third-party
 // code did not come with its own header file, so declaring the function here.)
 // Note: This algorithm is also in Blink under Source/wtf/StringHasher.h.
 extern "C" uint32_t SuperFastHash(const char* data, int len);
 
 namespace base {
 
-uint32_t SuperFastHash(const char* data, int len) {
-  return ::SuperFastHash(data, len);
+uint32_t SuperFastHash(const char* data, size_t length) {
+  if (length > static_cast<size_t>(std::numeric_limits<int>::max())) {
+    NOTREACHED();
+    return 0;
+  }
+  return ::SuperFastHash(data, static_cast<int>(length));
 }
 
 }  // namespace base