Addressing C4267 warnings for printing.

printing/emf_win.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_EMF_WIN_H_
 #define PRINTING_EMF_WIN_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <windows.h>
@@ skipping 39 matching lines @@
 
   // Generates a new metafile that will record every GDI command, and will
   // be saved to |metafile_path|.
   bool InitToFile(const base::FilePath& metafile_path);
 
   // Initializes the Emf with the data in |metafile_path|.
   bool InitFromFile(const base::FilePath& metafile_path);
 
   // Metafile methods.
   bool Init() override;
-  bool InitFromData(const void* src_buffer,
-                    uint32_t src_buffer_size) override;
+  bool InitFromData(const void* src_buffer, size_t src_buffer_size) override;
 
   // Inserts a custom GDICOMMENT records indicating StartPage/EndPage calls
   // (since StartPage and EndPage do not work in a metafile DC). Only valid
   // when hdc_ is non-NULL. |page_size|, |content_area|, and |scale_factor| are
   // ignored.
   void StartPage(const gfx::Size& page_size,
                  const gfx::Rect& content_area,
                  const float& scale_factor) override;
   bool FinishPage() override;
   bool FinishDocument() override;
@@ skipping 113 matching lines @@
   std::vector<Record> items_;
 
   EnumerationContext context_;
 
   DISALLOW_COPY_AND_ASSIGN(Enumerator);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_EMF_WIN_H_