Cleanup: Use base namespace in printing/.

printing/backend/print_backend.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/backend/print_backend.h"
 
 #include <algorithm>
 
 #include "third_party/icu/source/common/unicode/uchar.h"
 #include "ui/gfx/text_elider.h"
@@ skipping 20 matching lines @@
       duplex_default(UNKNOWN_DUPLEX_MODE) {}
 
 PrinterSemanticCapsAndDefaults::~PrinterSemanticCapsAndDefaults() {}
 
 PrinterCapsAndDefaults::PrinterCapsAndDefaults() {}
 
 PrinterCapsAndDefaults::~PrinterCapsAndDefaults() {}
 
 PrintBackend::~PrintBackend() {}
 
-string16 PrintBackend::SimplifyDocumentTitle(const string16& title) {
-  string16 no_controls(title);
+base::string16 PrintBackend::SimplifyDocumentTitle(
+    const base::string16& title) {
+  base::string16 no_controls(title);
   no_controls.erase(
     std::remove_if(no_controls.begin(), no_controls.end(), &u_iscntrl),
     no_controls.end());
-  string16 result;
+  base::string16 result;
   gfx::ElideString(no_controls, kMaxDocumentTitleLength, &result);
   return result;
 }
 
 }  // namespace printing