Remove IPC_BEGIN_MESSAGE_MAP_EX macro since r270839 made all bad IPCs kill their child processes.

content/browser/loader/resource_scheduler_filter.cc

Index: content/browser/loader/resource_scheduler_filter.cc
===================================================================
--- content/browser/loader/resource_scheduler_filter.cc	(revision 271040)
+++ content/browser/loader/resource_scheduler_filter.cc	(working copy)
@@ -27,8 +27,7 @@
 ResourceSchedulerFilter::~ResourceSchedulerFilter() {
 }
 
-bool ResourceSchedulerFilter::OnMessageReceived(const IPC::Message& message,
-                                                bool* message_was_ok) {
+bool ResourceSchedulerFilter::OnMessageReceived(const IPC::Message& message) {
   ResourceScheduler* scheduler =
       ResourceDispatcherHostImpl::Get()->scheduler();
   // scheduler can be NULL during shutdown, in which case it's ok to ignore the