For PWG raster file creation, use FLAG_WRITE instead of FLAG_APPEND

chrome/browser/local_discovery/pwg_raster_converter.cc

 // Copyright 2013 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 "chrome/browser/local_discovery/pwg_raster_converter.h"
 
 #include "base/bind_helpers.h"
 #include "base/cancelable_callback.h"
 #include "base/file_util.h"
 #include "base/files/file.h"
@@ skipping 58 matching lines @@
   }
 
   if (static_cast<int>(data->size()) !=
       base::WriteFile(GetPdfPath(), data->front_as<char>(), data->size())) {
     return;
   }
 
   // Reopen in read only mode.
   pdf_file_.Initialize(GetPdfPath(),
                        base::File::FLAG_OPEN | base::File::FLAG_READ);
-  pwg_file_.Initialize(
-      GetPwgPath(),
-      base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_APPEND);
+  pwg_file_.Initialize(GetPwgPath(),
+                       base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
 }
 
 bool FileHandlers::IsValid() {
   return pdf_file_.IsValid() && pwg_file_.IsValid();
 }
 
 // Converts PDF into PWG raster.
 // Class uses 3 threads: UI, IO and FILE.
 // Internal workflow is following:
 // 1. Create instance on the UI thread. (files_, settings_,)
@@ skipping 185 matching lines @@
 }
 
 }  // namespace
 
 // static
 scoped_ptr<PWGRasterConverter> PWGRasterConverter::CreateDefault() {
   return scoped_ptr<PWGRasterConverter>(new PWGRasterConverterImpl());
 }
 
 }  // namespace local_discovery