Enable (optional) blocking of webrequests in case a PAC script cannot be fetched or is invalid.

chrome/browser/policy/configuration_policy_pref_store.cc

Index: chrome/browser/policy/configuration_policy_pref_store.cc
diff --git a/chrome/browser/policy/configuration_policy_pref_store.cc b/chrome/browser/policy/configuration_policy_pref_store.cc
index 58d18508aabe05cd888ded730603432a6711b446..a958acd6ec3dc31024cfe8456dff6da4879bb960 100644
--- a/chrome/browser/policy/configuration_policy_pref_store.cc
+++ b/chrome/browser/policy/configuration_policy_pref_store.cc
@@ -679,7 +679,7 @@ void ConfigurationPolicyPrefKeeper::ApplyProxySettings() {
       std::string pac_url;
       proxy_policies_[kPolicyProxyPacUrl]->GetAsString(&pac_url);
       prefs_.SetValue(prefs::kProxy,
-                      ProxyConfigDictionary::CreatePacScript(pac_url));
+                      ProxyConfigDictionary::CreatePacScript(pac_url, false));
       break;
     }
     case ProxyPrefs::MODE_FIXED_SERVERS: {