CHECK that URLRequestJobs are not orphaned while blocked by extensions.

extensions/browser/api/web_request/web_request_api.cc

 // Copyright (c) 2012 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.
 
 #include "extensions/browser/api/web_request/web_request_api.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 1208 matching lines @@
     void* browser_context,
     const net::URLRequest* request) {
   ClearPendingCallbacks(request);
 
   signaled_requests_.erase(request->identifier());
 
   request_time_tracker_->LogRequestEndTime(request->identifier(),
                                            base::Time::Now());
 }
 
+void ExtensionWebRequestEventRouter::OnURLRequestJobOrphaned(
+    void* browser_context,
+    const net::URLRequest* request) {
+  // See https://crbug.com/289715. While a URLRequest is blocking on an
+  // extension, it may not orphan jobs unless OnURLRequestDestroyed is called
+  // first.
+  //
+  // TODO(davidben): Remove this when the crash has been diagnosed.
+  CHECK_EQ(0u, blocked_requests_.count(request->identifier()));

[mmenke, 2015/09/14 15:18:27]

Maybe toss the URL on the stack?

One of the possibilities is that this is an issue with either magic
URLRequestJob subclasses doing stuff when they shouldn't be, or magic
URLRequestJobFactory/Interceptor classes.  The URL may be able to point at one
of those.

[davidben, 2015/09/14 19:55:55]

Done.

+}
+
 void ExtensionWebRequestEventRouter::ClearPendingCallbacks(
     const net::URLRequest* request) {
   blocked_requests_.erase(request->identifier());
 }
 
 bool ExtensionWebRequestEventRouter::DispatchEvent(
     void* browser_context,
     net::URLRequest* request,
     const std::vector<const EventListener*>& listeners,
     const base::ListValue& args) {
@@ skipping 1243 matching lines @@
   // Continue gracefully.
   RunSync();
 }
 
 bool WebRequestHandlerBehaviorChangedFunction::RunSync() {
   helpers::ClearCacheOnNavigation();
   return true;
 }
 
 }  // namespace extensions