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

chrome/browser/printing/printer_query.cc

Index: chrome/browser/printing/printer_query.cc
===================================================================
--- chrome/browser/printing/printer_query.cc	(revision 68914)
+++ chrome/browser/printing/printer_query.cc	(working copy)
@@ -5,7 +5,6 @@
 #include "chrome/browser/printing/printer_query.h"
 
 #include "base/message_loop.h"
-#include "base/thread_restrictions.h"
 #include "chrome/browser/printing/print_job_worker.h"
 
 namespace printing {
@@ -97,10 +96,6 @@
 
 void PrinterQuery::StopWorker() {
   if (worker_.get()) {
-    // http://crbug.com/66082: We're blocking on the PrinterQuery's worker
-    // thread.  It's not clear to me if this may result in blocking the current
-    // thread for an unacceptable time.  We should probably fix it.
-    base::ThreadRestrictions::ScopedAllowIO allow_io;
     worker_->Stop();
     worker_.reset();
   }