Kill worker process by way of a sync IPC message before it cleans up.

content/browser/worker_host/worker_process_host.cc

Index: content/browser/worker_host/worker_process_host.cc
diff --git a/content/browser/worker_host/worker_process_host.cc b/content/browser/worker_host/worker_process_host.cc
index c537447f987a83de52b9c590334b3cf8fac83f02..7756c00ceae690db1fd0f4c5b926398c5cf5c8f1 100644
--- a/content/browser/worker_host/worker_process_host.cc
+++ b/content/browser/worker_host/worker_process_host.cc
@@ -337,6 +337,8 @@ bool WorkerProcessHost::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_AllowDatabase, OnAllowDatabase)
     IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_AllowFileSystem, OnAllowFileSystem)
     IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_AllowIndexedDB, OnAllowIndexedDB)
+    IPC_MESSAGE_HANDLER(WorkerProcessHostMsg_ForceKillWorker,
+                        OnForceKillWorkerProcess)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
 
@@ -407,6 +409,12 @@ void WorkerProcessHost::OnAllowIndexedDB(int worker_route_id,
       url, name, resource_context_, GetRenderViewIDsForWorker(worker_route_id));
 }
 
+void WorkerProcessHost::OnForceKillWorkerProcess(int worker_route_id,
+                                                 base::ProcessHandle handle,
+                                                 bool* result) {
+  *result = base::KillProcess(handle, 0, false);
+}
+
 void WorkerProcessHost::RelayMessage(
     const IPC::Message& message,
     WorkerMessageFilter* filter,