Use file handles to interact with utility process.

chrome/service/cloud_print/print_system.h

Index: chrome/service/cloud_print/print_system.h
diff --git a/chrome/service/cloud_print/print_system.h b/chrome/service/cloud_print/print_system.h
index 2da5f31ecbed5b64fea932a2596e91eb8c467437..41cd258ab434a463fe695353d562fa5ab62038cc 100644
--- a/chrome/service/cloud_print/print_system.h
+++ b/chrome/service/cloud_print/print_system.h
@@ -75,11 +75,11 @@ class PrintSystem : public base::RefCountedThreadSafe<PrintSystem> {
     // Callback interface for new printer notifications.
     class Delegate {
       public:

[Lei Zhang, 2014/09/15 21:49:53]

nit: actually this is indented 1 space too many.

[Vitaly Buka (NO REVIEWS), 2014/09/15 22:33:50]

Done.

-        virtual void OnPrinterAdded() = 0;
+       virtual void OnPrinterAdded() = 0;
         // TODO(gene): Do we need OnPrinterDeleted notification here?
 
       protected:
-        virtual ~Delegate() {}
+       virtual ~Delegate() {}
     };
 
     virtual bool StartWatching(PrintServerWatcher::Delegate* delegate) = 0;
@@ -95,12 +95,12 @@ class PrintSystem : public base::RefCountedThreadSafe<PrintSystem> {
     // Callback interface for printer updates notifications.
     class Delegate {
       public:
-        virtual void OnPrinterDeleted() = 0;
-        virtual void OnPrinterChanged() = 0;
-        virtual void OnJobChanged() = 0;
+       virtual void OnPrinterDeleted() = 0;
+       virtual void OnPrinterChanged() = 0;
+       virtual void OnJobChanged() = 0;
 
       protected:
-        virtual ~Delegate() {}
+       virtual ~Delegate() {}
     };
 
     virtual bool StartWatching(PrinterWatcher::Delegate* delegate) = 0;