Get a descriptive error name from ICU

url/url_canon_icu.cc

Index: url/url_canon_icu.cc
diff --git a/url/url_canon_icu.cc b/url/url_canon_icu.cc
index 8a80d7109d9cc925090ee247ef17253eb53136bb..4b9c2a334aea6178f38408d6398586452024bc26 100644
--- a/url/url_canon_icu.cc
+++ b/url/url_canon_icu.cc
@@ -12,6 +12,7 @@
 #include "third_party/icu/source/common/unicode/ucnv.h"
 #include "third_party/icu/source/common/unicode/ucnv_cb.h"
 #include "third_party/icu/source/common/unicode/uidna.h"
+#include "third_party/icu/source/common/unicode/utypes.h"
 #include "url/url_canon_icu.h"
 #include "url/url_canon_internal.h"  // for _itoa_s
 
@@ -100,7 +101,8 @@ struct UIDNAWrapper {
     // registrars, search engines) converge toward a consensus.
     value = uidna_openUTS46(UIDNA_CHECK_BIDI, &err);
     if (U_FAILURE(err)) {
-      CHECK(false) << "failed to open UTS46 data with error: " << err;
+      CHECK(false) << "failed to open UTS46 data with error: "
+                   << u_errorName(err);
       value = NULL;
     }
   }