Add printing.dll to the component build.

printing/print_settings_initializer_gtk.h

 // Copyright (c) 2010 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_PRINT_SETTINGS_INITIALIZER_GTK_H_
 #define PRINTING_PRINT_SETTINGS_INITIALIZER_GTK_H_
 
 #include "base/logging.h"
 #include "printing/page_range.h"
 
 typedef struct _GtkPrintSettings GtkPrintSettings;
 typedef struct _GtkPageSetup GtkPageSetup;
 
 namespace printing {
 
 class PrintSettings;
 
 // Initializes a PrintSettings object from the provided Gtk printer objects.
-class PrintSettingsInitializerGtk {
+class PRINTING_EXPORT PrintSettingsInitializerGtk {
  public:
   static void InitPrintSettings(GtkPrintSettings* settings,
                                 GtkPageSetup* page_setup,
                                 const PageRanges& new_ranges,
                                 bool print_selection_only,
                                 PrintSettings* print_settings);
 
   // The default margins, in points. These values are based on 72 dpi,
   // with 0.25 margins on top, left, and right, and 0.56 on bottom.
   static const double kTopMarginInInch;
   static const double kRightMarginInInch;
   static const double kBottomMarginInInch;
   static const double kLeftMarginInInch;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PrintSettingsInitializerGtk);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PRINT_SETTINGS_INITIALIZER_GTK_H_