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 a228f9cf0ebf31c12ff7f4945da061c94cdeebc9..04a977ca1cfb2919aba431c421acc01cdd348ba3 100644
--- a/content/browser/worker_host/worker_process_host.cc
+++ b/content/browser/worker_host/worker_process_host.cc
@@ -318,6 +318,8 @@ 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()
 
@@ -388,6 +390,11 @@ void WorkerProcessHost::OnAllowIndexedDB(int worker_route_id,
       url, name, resource_context_, GetRenderViewIDsForWorker(worker_route_id));
 }
 
+void WorkerProcessHost::OnForceKillWorkerProcess() {
+  base::KillProcess(
+        process_->GetData().handle, RESULT_CODE_KILLED_BAD_MESSAGE, false);
+}
+
 void WorkerProcessHost::RelayMessage(
     const IPC::Message& message,
     WorkerMessageFilter* filter,