Change SuperFastHash signature to use size_t, not int.

base/hash.h

Index: base/hash.h
diff --git a/base/hash.h b/base/hash.h
index 97e251cdf1ed8031e1b1adc79d999fd10e303d39..7c0fba6d39e97a4b0d8a6faf9f43ab905310fc0b 100644
--- a/base/hash.h
+++ b/base/hash.h
@@ -18,16 +18,12 @@
 namespace base {
 
 // WARNING: This hash function should not be used for any cryptographic purpose.
-BASE_EXPORT uint32_t SuperFastHash(const char* data, int len);
+BASE_EXPORT uint32_t SuperFastHash(const char* data, size_t length);
 
 // Computes a hash of a memory buffer |data| of a given |length|.
 // WARNING: This hash function should not be used for any cryptographic purpose.
 inline uint32_t Hash(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));
+  return SuperFastHash(data, length);
 }
 
 // Computes a hash of a string |str|.