Replace IOAllowed with WaitAllowed in PlatformThread::Join()

base/threading/thread_restrictions.h

Index: base/threading/thread_restrictions.h
diff --git a/base/threading/thread_restrictions.h b/base/threading/thread_restrictions.h
index 18274341d63803c2f48272f6b078f9082a661b09..077c35ac997e987bb4741108a1a5ea09e2623a83 100644
--- a/base/threading/thread_restrictions.h
+++ b/base/threading/thread_restrictions.h
@@ -31,6 +31,7 @@ namespace content {
 class BrowserGpuChannelHostFactory;
 class BrowserGpuMemoryBufferManager;
 class BrowserMainLoop;
+class BrowserProcessSubThread;
 class BrowserShutdownProfileDumper;
 class BrowserSurfaceViewManager;
 class BrowserTestBase;
@@ -176,6 +177,7 @@ class BASE_EXPORT ThreadRestrictions {
   // DO NOT ADD ANY OTHER FRIEND STATEMENTS, talk to jam or brettw first.
   // BEGIN ALLOWED USAGE.
   friend class content::BrowserMainLoop;
+  friend class content::BrowserProcessSubThread;
   friend class content::BrowserShutdownProfileDumper;
   friend class content::BrowserSurfaceViewManager;
   friend class content::BrowserTestBase;