CHECK that URLRequestJobs are not orphaned while blocked by extensions.

extensions/browser/api/web_request/web_request_api.cc

Index: extensions/browser/api/web_request/web_request_api.cc
diff --git a/extensions/browser/api/web_request/web_request_api.cc b/extensions/browser/api/web_request/web_request_api.cc
index 40b9db7ddf0c080438019823b180f00b6bd38c03..6b6513e0ec09352d2376ca5fe53c5fd9030ff3f3 100644
--- a/extensions/browser/api/web_request/web_request_api.cc
+++ b/extensions/browser/api/web_request/web_request_api.cc
@@ -1226,6 +1226,17 @@ void ExtensionWebRequestEventRouter::OnURLRequestDestroyed(
                                            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());