Handle ERR_PAC_SCRIPT_TERMINATED in ProxyService.

net/proxy/proxy_service.cc

Index: net/proxy/proxy_service.cc
diff --git a/net/proxy/proxy_service.cc b/net/proxy/proxy_service.cc
index f912d2e91432265d432d6b1d82558156fd0a99ac..2433521d54ff7b0ff260c04563745012cd24ea51 100644
--- a/net/proxy/proxy_service.cc
+++ b/net/proxy/proxy_service.cc
@@ -868,6 +868,10 @@ class ProxyService::PacRequest
   int QueryDidComplete(int result_code) {
     DCHECK(!was_cancelled());
 
+    // Clear |resolve_job_| so is_started() returns false while
+    // DidFinishResolvingProxy() runs.
+    resolve_job_ = nullptr;
+
     // Note that DidFinishResolvingProxy might modify |results_|.
     int rv = service_->DidFinishResolvingProxy(url_, load_flags_,
                                                network_delegate_, results_,
@@ -882,7 +886,6 @@ class ProxyService::PacRequest
     results_->proxy_resolve_end_time_ = TimeTicks::Now();
 
     // Reset the state associated with in-progress-resolve.
-    resolve_job_ = NULL;
     config_id_ = ProxyConfig::kInvalidConfigID;
     config_source_ = PROXY_CONFIG_SOURCE_UNKNOWN;
 
@@ -1399,6 +1402,7 @@ int ProxyService::DidFinishResolvingProxy(const GURL& url,
     net_log.AddEventWithNetErrorCode(
         NetLog::TYPE_PROXY_SERVICE_RESOLVED_PROXY_LIST, result_code);
 
+    bool reset_config = result_code == ERR_PAC_SCRIPT_TERMINATED;
     if (!config_.pac_mandatory()) {
       // Fall-back to direct when the proxy resolver fails. This corresponds
       // with a javascript runtime error in the PAC script.
@@ -1417,6 +1421,14 @@ int ProxyService::DidFinishResolvingProxy(const GURL& url,
     } else {
       result_code = ERR_MANDATORY_PROXY_CONFIGURATION_FAILED;
     }
+    if (reset_config) {
+      ResetProxyConfig(false);
+      // If the ProxyResolver crashed, force it to be re-initialized for the
+      // next request by resetting the proxy config. If there are other pending
+      // requests, trigger the recreation immediately so those requests retry.
+      if (pending_requests_.size() > 1)
+        ApplyProxyConfigIfAvailable();
+    }
   }
 
   net_log.EndEvent(NetLog::TYPE_PROXY_SERVICE);