Revert 68893 - Consider PlatformThread::Join() to be blocking IO....

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
===================================================================
--- chrome/browser/browser_process_impl.cc	(revision 68914)
+++ chrome/browser/browser_process_impl.cc	(working copy)
@@ -13,7 +13,6 @@
 #include "base/path_service.h"
 #include "base/task.h"
 #include "base/thread.h"
-#include "base/thread_restrictions.h"
 #include "base/waitable_event.h"
 #include "chrome/browser/appcache/chrome_appcache_service.h"
 #include "chrome/browser/automation/automation_provider_list.h"
@@ -253,12 +252,6 @@
   DCHECK_NE(0u, module_ref_count_);
   module_ref_count_--;
   if (0 == module_ref_count_) {
-    // Allow UI and IO threads to do blocking IO on shutdown, since we do a lot
-    // of it on shutdown for valid reasons.
-    base::ThreadRestrictions::SetIOAllowed(true);
-    io_thread()->message_loop()->PostTask(
-        FROM_HERE,
-        NewRunnableFunction(&base::ThreadRestrictions::SetIOAllowed, true));
     MessageLoop::current()->PostTask(
         FROM_HERE, NewRunnableFunction(DidEndMainMessageLoop));
     MessageLoop::current()->Quit();