Fix license headers in a number of files

printing/page_number.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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/page_number.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "printing/print_settings.h"
 
@@ skipping 62 matching lines @@
 bool PageNumber::operator==(const PageNumber& other) const {
   return page_number_ == other.page_number_ &&
          page_range_index_ == other.page_range_index_;
 }
 bool PageNumber::operator!=(const PageNumber& other) const {
   return page_number_ != other.page_number_ ||
          page_range_index_ != other.page_range_index_;
 }
 
 }  // namespace printing