Cleanup: Use base namespace in printing/.

printing/printing_context_mac.mm

 // Copyright (c) 2011 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_mac.h"
 
 #import <ApplicationServices/ApplicationServices.h>
 #import <AppKit/AppKit.h>
 
 #import <iomanip>
@@ skipping 402 matching lines @@
   DCHECK(!in_print_job_);
 
   settings_ = settings;
 
   NOTIMPLEMENTED();
 
   return FAILED;
 }
 
 PrintingContext::Result PrintingContextMac::NewDocument(
-    const string16& document_name) {
+    const base::string16& document_name) {
   DCHECK(!in_print_job_);
 
   in_print_job_ = true;
 
   PMPrintSession print_session =
       static_cast<PMPrintSession>([print_info_.get() PMPrintSession]);
   PMPrintSettings print_settings =
       static_cast<PMPrintSettings>([print_info_.get() PMPrintSettings]);
   PMPageFormat page_format =
       static_cast<PMPageFormat>([print_info_.get() PMPageFormat]);
@@ skipping 76 matching lines @@
 void PrintingContextMac::ReleaseContext() {
   print_info_.reset();
   context_ = NULL;
 }
 
 gfx::NativeDrawingContext PrintingContextMac::context() const {
   return context_;
 }
 
 }  // namespace printing