Fix console messages in SRI errors.

Source/core/frame/SubresourceIntegrity.cpp

Index: Source/core/frame/SubresourceIntegrity.cpp
diff --git a/Source/core/frame/SubresourceIntegrity.cpp b/Source/core/frame/SubresourceIntegrity.cpp
index e65193dec20431aaa7c12ea52ee20b60d6ecaaa7..3fefa291430bc9830c005592033dc3b6f1b7fd42 100644
--- a/Source/core/frame/SubresourceIntegrity.cpp
+++ b/Source/core/frame/SubresourceIntegrity.cpp
@@ -108,6 +108,7 @@ bool SubresourceIntegrity::CheckSubresourceIntegrity(const Element& element, con
         }
     }
 
+    digest.clear();
     if (computeDigest(HashAlgorithmSha256, normalizedSource.data(), normalizedSource.length(), digest)) {
         // This message exposes the digest of the resource to the console.
         // Because this is only to the console, that's okay for now, but we