[net-internals] Remove resolved hostname from UDP_SOCKET event description.

chrome/browser/resources/net_internals/source_entry.js

Index: chrome/browser/resources/net_internals/source_entry.js
diff --git a/chrome/browser/resources/net_internals/source_entry.js b/chrome/browser/resources/net_internals/source_entry.js
index fb251e8c6b012ea8ebb47f77e22b88e8e9950a78..cc3b42992552c3db1ea1ad57413bda9465b9db6b 100644
--- a/chrome/browser/resources/net_internals/source_entry.js
+++ b/chrome/browser/resources/net_internals/source_entry.js
@@ -117,6 +117,7 @@ var SourceEntry = (function() {
             // If the parent of |this| is a HOST_RESOLVER_IMPL_JOB, use
             // '<DNS Server IP> [<host we're resolving>]'.
             if (this.entries_[0].type == EventType.SOCKET_ALIVE &&
+                this.entries_[0].params &&
                 this.entries_[0].params.source_dependency != undefined) {
               var parentId = this.entries_[0].params.source_dependency.id;
               var parent = SourceTracker.getInstance().getSourceEntry(parentId);