Change PDF scaling factor from double to float.

chrome/utility/printing_handler.h

 // 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.
 
 #ifndef CHROME_UTILITY_PRINTING_HANDLER_H_
 #define CHROME_UTILITY_PRINTING_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "chrome/utility/utility_message_handler.h"
@@ skipping 36 matching lines @@
       IPC::PlatformFileForTransit pdf_transit,
       const printing::PdfRenderSettings& settings,
       const printing::PwgRasterSettings& bitmap_settings,
       IPC::PlatformFileForTransit bitmap_transit);
 #endif  // ENABLE_FULL_PRINTING
 
 #if defined(OS_WIN)
   int LoadPDF(base::File pdf_file);
   bool RenderPdfPageToMetafile(int page_number,
                                base::File output_file,
-                               double* scale_factor);
+                               float* scale_factor);
 #endif  // OS_WIN
 #if defined(ENABLE_FULL_PRINTING)
   bool RenderPDFPagesToPWGRaster(
       base::File pdf_file,
       const printing::PdfRenderSettings& settings,
       const printing::PwgRasterSettings& bitmap_settings,
       base::File bitmap_file);
 
   void OnGetPrinterCapsAndDefaults(const std::string& printer_name);
   void OnGetPrinterSemanticCapsAndDefaults(const std::string& printer_name);
 #endif  // ENABLE_FULL_PRINTING
 
 #if defined(OS_WIN)
   std::vector<char> pdf_data_;
   printing::PdfRenderSettings pdf_rendering_settings_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PrintingHandler);
 };
 
 #endif  // CHROME_UTILITY_PRINTING_HANDLER_H_