Remove -Wno-unused-private-field clang warning suppression.

chrome/service/cloud_print/print_system_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/service/cloud_print/print_system.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/json/json_writer.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 17 matching lines @@
 #include "printing/printing_utils.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace cloud_print {
 
 namespace {
 
 class PrintSystemWatcherWin : public base::win::ObjectWatcher::Delegate {
  public:
   PrintSystemWatcherWin()
-      : delegate_(NULL),
-        did_signal_(false) {
+      : delegate_(NULL) {
   }
   ~PrintSystemWatcherWin() override { Stop(); }
 
   class Delegate {
    public:
     virtual ~Delegate() {}
     virtual void OnPrinterAdded() = 0;
     virtual void OnPrinterDeleted() = 0;
     virtual void OnPrinterChanged() = 0;
     virtual void OnJobChanged() = 0;
@@ skipping 64 matching lines @@
     DCHECK(printer_info);
     return InitBasicPrinterInfo(printer_.Get(), printer_info);
   }
 
  private:
   base::win::ObjectWatcher watcher_;
   printing::ScopedPrinterHandle printer_;  // The printer being watched
   // Returned by FindFirstPrinterChangeNotifier.
   printing::ScopedPrinterChangeHandle printer_change_;
   Delegate* delegate_;           // Delegate to notify
-  bool did_signal_;              // DoneWaiting was called
   std::string printer_info_;     // For crash reporting.
 };
 
 class PrintServerWatcherWin
   : public PrintSystem::PrintServerWatcher,
     public PrintSystemWatcherWin::Delegate {
  public:
   PrintServerWatcherWin() : delegate_(NULL) {}
 
   // PrintSystem::PrintServerWatcher implementation.
@@ skipping 681 matching lines @@
 }
 
 }  // namespace
 
 scoped_refptr<PrintSystem> PrintSystem::CreateInstance(
     const base::DictionaryValue* print_system_settings) {
   return new PrintSystemWin;
 }
 
 }  // namespace cloud_print