Fix uninitialized memory bug from scaling addition

printing/print_settings.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/print_settings.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "printing/print_job_constants.h"
@@ skipping 124 matching lines @@
   margin_type_ = DEFAULT_MARGINS;
   desired_dpi_ = 72;
   selection_only_ = false;
   title_ = base::string16();
   url_ = base::string16();
   display_header_footer_ = false;
   device_name_.clear();
   requested_media_ = RequestedMedia();
   page_setup_device_units_.Clear();
   dpi_ = 0;
+  scale_factor_ = 1.0f;
   landscape_ = false;
   supports_alpha_blend_ = true;
   should_print_backgrounds_ = false;
   collate_ = false;
   color_ = UNKNOWN_COLOR_MODEL;
   copies_ = 0;
   duplex_mode_ = UNKNOWN_DUPLEX_MODE;
 #if defined(OS_WIN)
   print_text_with_gdi_ = false;
   printer_is_xps_ = false;
@@ skipping 86 matching lines @@
 }
 
 void PrintSettings::SetOrientation(bool landscape) {
   if (landscape_ != landscape) {
     landscape_ = landscape;
     page_setup_device_units_.FlipOrientation();
   }
 }
 
 }  // namespace printing