Cleanup: Use base namespace in printing/.

printing/printing_context_gtk.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 "printing/printing_context_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gtk/gtkunixprint.h>
 
 #include "base/logging.h"
@@ skipping 85 matching lines @@
 PrintingContext::Result PrintingContextGtk::InitWithSettings(
     const PrintSettings& settings) {
   DCHECK(!in_print_job_);
 
   settings_ = settings;
 
   return OK;
 }
 
 PrintingContext::Result PrintingContextGtk::NewDocument(
-    const string16& document_name) {
+    const base::string16& document_name) {
   DCHECK(!in_print_job_);
   in_print_job_ = true;
 
   document_name_ = document_name;
 
   return OK;
 }
 
 PrintingContext::Result PrintingContextGtk::NewPage() {
   if (abort_printing_)
@@ skipping 33 matching lines @@
   // Intentional No-op.
 }
 
 gfx::NativeDrawingContext PrintingContextGtk::context() const {
   // Intentional No-op.
   return NULL;
 }
 
 }  // namespace printing