Ensure that in-process plugins can't destroy themselves by closing a URLLoader

content/renderer/pepper/pepper_in_process_router.cc

Index: content/renderer/pepper/pepper_in_process_router.cc
diff --git a/content/renderer/pepper/pepper_in_process_router.cc b/content/renderer/pepper/pepper_in_process_router.cc
index 9194f12fb7f688d22773edd92bcaa6d3b8b416c0..d4dd85479523996aeddc0bd9acafcd1c80e1d933 100644
--- a/content/renderer/pepper/pepper_in_process_router.cc
+++ b/content/renderer/pepper/pepper_in_process_router.cc
@@ -103,14 +103,42 @@ bool PepperInProcessRouter::OnPluginMsgReceived(const IPC::Message& msg) {
 bool PepperInProcessRouter::SendToHost(IPC::Message* msg) {
   scoped_ptr<IPC::Message> message(msg);
 
+  // Unpack the message so we can peek at its nested type.
+  uint32 call_type = 0;
+  if (message->type() == PpapiHostMsg_ResourceCall::ID) {
+    ppapi::proxy::ResourceMessageCallParams call_params;
+    IPC::Message nested_msg;
+    if (!UnpackMessage<PpapiHostMsg_ResourceCall>(*msg, &call_params,
+                                                  &nested_msg)) {
+      NOTREACHED();
+      return false;
+    }
+    call_type = nested_msg.type();
+    // Repack the message.
+    message.reset(new PpapiHostMsg_ResourceCall(call_params, nested_msg));
+  }
+
   if (!message->is_sync()) {
-    // If this is a resource destroyed message, post a task to dispatch it.
-    // Dispatching it synchronously can cause the host to re-enter the proxy
-    // code while we're still in the resource destructor, leading to a crash.
-    // http://crbug.com/276368.
-    // This won't cause message reordering problems because the resource
-    // destroyed message is always the last one sent for a resource.
     if (message->type() == PpapiHostMsg_ResourceDestroyed::ID) {
+      // If this is a resource destroyed message, post a task to dispatch it.
+      // Dispatching it synchronously can cause the host to re-enter the proxy
+      // code while we're still in the resource destructor, leading to a crash.
+      // http://crbug.com/276368.
+      // This won't cause message reordering problems because the resource
+      // destroyed message is always the last one sent for a resource.
+      base::MessageLoop::current()->PostTask(
+          FROM_HERE,
+          base::Bind(&PepperInProcessRouter::DispatchHostMsg,
+                     weak_factory_.GetWeakPtr(),
+                     base::Owned(message.release())));
+      return true;
+    } else if (call_type == PpapiHostMsg_URLLoader_Close::ID) {
+      // If this is a PpapiHostMsg_URLLoader_Close, it could trigger the
+      // destruction of the instance (crbug.com/372548) so post a task to
+      // dispatch it as well. Because PpapiHostMsg_ResourceDestroyed messages
+      // are also posted above, ordering with respect to those messages will
+      // still be correct. Ordering with respect to other messages should not
+      // be important.
       base::MessageLoop::current()->PostTask(
           FROM_HERE,
           base::Bind(&PepperInProcessRouter::DispatchHostMsg,