Disallow UI/IO thread blocking on any other thread.

base/synchronization/condition_variable_win.cc

Index: base/synchronization/condition_variable_win.cc
===================================================================
--- base/synchronization/condition_variable_win.cc	(revision 133458)
+++ base/synchronization/condition_variable_win.cc	(working copy)
@@ -10,6 +10,7 @@
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/synchronization/lock.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time.h"
 
 namespace {
@@ -94,6 +95,7 @@
 }
 
 void WinVistaCondVar::TimedWait(const TimeDelta& max_time) {
+  base::ThreadRestrictions::AssertWaitAllowed();
   DWORD timeout = static_cast<DWORD>(max_time.InMilliseconds());
   CRITICAL_SECTION* cs = user_lock_.lock_.os_lock();