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..3d9b9beac30bbf54f1dd883df795bf84ee699ede 100644
--- a/extensions/browser/api/web_request/web_request_api.cc
+++ b/extensions/browser/api/web_request/web_request_api.cc
@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/debug/alias.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/macros.h"
@@ -1226,6 +1227,20 @@ 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.
+  char url_buf[128];
+  base::strlcpy(url_buf, request->url().spec().c_str(), arraysize(url_buf));
+  base::debug::Alias(url_buf);
+  CHECK_EQ(0u, blocked_requests_.count(request->identifier()));
+}
+
 void ExtensionWebRequestEventRouter::ClearPendingCallbacks(
     const net::URLRequest* request) {
   blocked_requests_.erase(request->identifier());