Add error description to the DidFailProvisionalLoad callback.

chrome/renderer/localized_error.cc

Index: chrome/renderer/localized_error.cc
diff --git a/chrome/renderer/localized_error.cc b/chrome/renderer/localized_error.cc
index 681d783b6cf7ec1af79815b693b3f0e92ca9acc8..ad14e962fab998b054e877c8d61b390cd6ec10c3 100644
--- a/chrome/renderer/localized_error.cc
+++ b/chrome/renderer/localized_error.cc
@@ -630,6 +630,15 @@ void LocalizedError::GetStrings(const WebKit::WebURLError& error,
   }
 }
 
+string16 LocalizedError::GetErrorDetails(const WebKit::WebURLError& error) {
+  const LocalizedErrorMap* error_map =
+      LookupErrorMap(error.domain.utf8(), error.reason);
+  if (error_map)
+    return l10n_util::GetStringUTF16(error_map->details_resource_id);
+  else
+    return l10n_util::GetStringUTF16(IDS_ERRORPAGES_DETAILS_UNKNOWN);
+}
+
 bool LocalizedError::HasStrings(const std::string& error_domain,
                                 int error_code) {
   return LookupErrorMap(error_domain, error_code) != NULL;