Print Preview end to end browser test uses correct DPI when converting PDF to PNG.

chrome/browser/printing/print_preview_pdf_generated_browsertest.cc

 // Copyright 2014 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 <algorithm>
 #include <fstream>
 #include <iostream>
 #include <iterator>
 #include <limits>
 #include <string>
@@ skipping 350 matching lines @@
     std::string pdf_data;
 
     ASSERT_TRUE(base::ReadFileToString(pdf_file_save_path_, &pdf_data));
     ASSERT_TRUE(pdf_doc_info_func_(pdf_data.data(),
                                    pdf_data.size(),
                                    &num_pages,
                                    &max_width_in_points));
 
     ASSERT_GT(num_pages, 0);
     double max_width_in_pixels =
-        ConvertPointsToPixelDouble(max_width_in_points);
+        ConvertUnitDouble(max_width_in_points, kPointsPerInch, kDpi);
 
     for (int i = 0; i < num_pages; ++i) {
       double width_in_points, height_in_points;
       ASSERT_TRUE(pdf_page_size_func_(pdf_data.data(),
                                       pdf_data.size(),
                                       i,
                                       &width_in_points,
                                       &height_in_points));
 
-      double width_in_pixels = ConvertPointsToPixelDouble(width_in_points);
-      double height_in_pixels = ConvertPointsToPixelDouble(height_in_points);
+      double width_in_pixels = ConvertUnitDouble(
+          width_in_points, kPointsPerInch, kDpi);
+      double height_in_pixels = ConvertUnitDouble(
+          height_in_points, kPointsPerInch, kDpi);
 
       // The image will be rotated if |width_in_pixels| is greater than
       // |height_in_pixels|. This is because the page will be rotated to fit
       // within a piece of paper. Therefore, |width_in_pixels| and
       // |height_in_pixels| have to be swapped or else they won't reflect the
       // dimensions of the rotated page.
       if (width_in_pixels > height_in_pixels)
         std::swap(width_in_pixels, height_in_pixels);
 
       total_height_in_pixels += height_in_pixels;
@@ skipping 299 matching lines @@
     // waiting for this message and start waiting for the image data.
     std::cout << "#EOF\n";
     std::cout.flush();
 
     SendPng();
     Reset();
   }
 }
 
 }  // namespace printing