service worker: Add crash keys for OnMessageReceived crash

content/browser/service_worker/embedded_worker_registry.h

Index: content/browser/service_worker/embedded_worker_registry.h
diff --git a/content/browser/service_worker/embedded_worker_registry.h b/content/browser/service_worker/embedded_worker_registry.h
index 8e83b1dabbfd5983cd038d4e62ddbbde1f8730e7..4a420b03b2c0674890124832a3042bb5e971bc94 100644
--- a/content/browser/service_worker/embedded_worker_registry.h
+++ b/content/browser/service_worker/embedded_worker_registry.h
@@ -111,6 +111,9 @@ class CONTENT_EXPORT EmbeddedWorkerRegistry
   friend class base::RefCounted<EmbeddedWorkerRegistry>;
   friend class EmbeddedWorkerInstance;
   friend class EmbeddedWorkerInstanceTest;
+  // TODO(falken): For temporary debugging. Remove when https://crbug.com/625040
+  // is fixed.
+  friend class ServiceWorkerDispatcherHost;
   FRIEND_TEST_ALL_PREFIXES(EmbeddedWorkerInstanceTest,
                            RemoveWorkerInSharedProcess);