More style nits.

chrome/browser/printing/print_job_unittest.cc

 // Copyright (c) 2008 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 "base/message_loop.h"
 #include "chrome/browser/printing/print_job.h"
 #include "chrome/browser/printing/print_job_worker.h"
 #include "chrome/common/notification_registrar.h"
 #include "chrome/common/notification_service.h"
 #include "printing/printed_pages_source.h"
@@ skipping 45 matching lines @@
   }
   virtual int cookie() const {
     return 42;
   }
  private:
   printing::PrintSettings settings_;
 };
 
 class TestPrintJob : public printing::PrintJob {
  public:
-  TestPrintJob(volatile bool* check) : check_(check) {
+  explicit TestPrintJob(volatile bool* check) : check_(check) {
   }
   ~TestPrintJob() {
     *check_ = true;
   }
  private:
   volatile bool* check_;
 };
 
 class TestPrintNotifObserv : public NotificationObserver {
  public:
@@ skipping 54 matching lines @@
   job->is_print_dialog_box_shown();
   job->document();
   // Private
   job->UpdatePrintedDocument(NULL);
   scoped_refptr<printing::JobEventDetails> event_details;
   job->OnNotifyPrintJobEvent(event_details);
   job->OnDocumentDone();
   job->ControlledWorkerShutdown();
   */
 }