Change PDF scaling factor from double to float.

printing/printed_document.h

 // 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.
 
 #ifndef PRINTING_PRINTED_DOCUMENT_H_
 #define PRINTING_PRINTED_DOCUMENT_H_
 
 #include <map>
 
 #include "base/files/file_path.h"
@@ skipping 30 matching lines @@
   PrintedDocument(const PrintSettings& settings,
                   PrintedPagesSource* source,
                   int cookie,
                   base::TaskRunner* blocking_runner);
 
   // Sets a page's data. 0-based. Takes metafile ownership.
   // Note: locks for a short amount of time.
   void SetPage(int page_number,
                scoped_ptr<MetafilePlayer> metafile,
 #if defined(OS_WIN)
-               double shrink,
+               float shrink,
 #endif  // OS_WIN
                const gfx::Size& paper_size,
                const gfx::Rect& page_rect);
 
   // Retrieves a page. If the page is not available right now, it
   // requests to have this page be rendered and returns NULL.
   // Note: locks for a short amount of time.
   scoped_refptr<PrintedPage> GetPage(int page_number);
 
   // Draws the page in the context.
@@ skipping 122 matching lines @@
 
   // All the immutable members.
   const Immutable immutable_;
 
   DISALLOW_COPY_AND_ASSIGN(PrintedDocument);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINTED_DOCUMENT_H_