Fix a crash when processing an invalid PAC script.

net/data/proxy_resolver_v8_unittest/exception_findproxyforurl_during_init.js

Index: net/data/proxy_resolver_v8_unittest/exception_findproxyforurl_during_init.js
diff --git a/net/data/proxy_resolver_v8_unittest/exception_findproxyforurl_during_init.js b/net/data/proxy_resolver_v8_unittest/exception_findproxyforurl_during_init.js
new file mode 100644
index 0000000000000000000000000000000000000000..9ce68352a79fa6b9fdd40ada949ac828fb613789
--- /dev/null
+++ b/net/data/proxy_resolver_v8_unittest/exception_findproxyforurl_during_init.js
@@ -0,0 +1,12 @@
+// Copyright (c) 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This PAC script will throw an exception when accessing the
+// "FindProxyForURL" property.
+
+function FindProxyForURLGetter() {
+  throw "crash!";
+}
+
+Object.defineProperty(this, "FindProxyForURL", {get: FindProxyForURLGetter});