[webcrypto] Set the error type for failures.

content/child/webcrypto/webcrypto_impl.cc

Index: content/child/webcrypto/webcrypto_impl.cc
diff --git a/content/child/webcrypto/webcrypto_impl.cc b/content/child/webcrypto/webcrypto_impl.cc
index cc18630e4a7c402400a9d796c6c9ea4380f06ff7..ad0877106a6226dbb6529a9a9cc8fbf2ac3644de 100644
--- a/content/child/webcrypto/webcrypto_impl.cc
+++ b/content/child/webcrypto/webcrypto_impl.cc
@@ -21,10 +21,18 @@ namespace {
 
 void CompleteWithError(const Status& status, blink::WebCryptoResult* result) {
   DCHECK(status.IsError());
-  if (status.HasErrorDetails())
-    result->completeWithError(blink::WebString::fromUTF8(status.ToString()));
+
+#if defined(WEBCRYPTO_HAS_ERROR_TYPE)
+  result->completeWithError(status.error_type(),
+                            blink::WebString::fromUTF8(status.error_details()));
+#else
+  // TODO(eroman): Delete once Blink changes have rolled into Chromium.
+  if (!status.error_details().empty())
+    result->completeWithError(
+        blink::WebString::fromUTF8(status.error_details()));
   else
     result->completeWithError();
+#endif
 }
 
 bool IsAlgorithmAsymmetric(const blink::WebCryptoAlgorithm& algorithm) {