[Downloads] Rework how hashes are calculated for download files.

crypto/third_party/nss/sha512.cc

Index: crypto/third_party/nss/sha512.cc
diff --git a/crypto/third_party/nss/sha512.cc b/crypto/third_party/nss/sha512.cc
index 5ef4e5062dcb1d746b0d6bfc0fda50b5195d7cd7..c9d0be0a0887e83112fb90257009631088bd1536 100644
--- a/crypto/third_party/nss/sha512.cc
+++ b/crypto/third_party/nss/sha512.cc
@@ -471,6 +471,10 @@ SHA256_End(SHA256Context *ctx, unsigned char *digest,
 	*digestLen = padLen;
 }
 
+void SHA256_Clone(SHA256Context* dest, SHA256Context* src) {
+  memcpy(dest, src, sizeof *dest);
+}
+
 /* Comment out unused code, mostly the SHA384 and SHA512 implementations. */
 #if 0
 SECStatus
@@ -519,12 +523,6 @@ SHA256_Resurrect(unsigned char *space, void *arg)
     return ctx;
 }
 
-void SHA256_Clone(SHA256Context *dest, SHA256Context *src)
-{
-    memcpy(dest, src, sizeof *dest);
-}
-
-
 /* ======= SHA512 and SHA384 common constants and defines ================= */
 
 /* common #defines for SHA512 and SHA384 */