Add printing.dll to the component build.

printing/page_setup.h

Index: printing/page_setup.h
===================================================================
--- printing/page_setup.h	(revision 99019)
+++ printing/page_setup.h	(working copy)
@@ -5,12 +5,13 @@
 #ifndef PRINTING_PAGE_SETUP_H_
 #define PRINTING_PAGE_SETUP_H_
 
+#include "printing/printing_export.h"
 #include "ui/gfx/rect.h"
 
 namespace printing {
 
 // Margins for a page setup.
-class PageMargins {
+class PRINTING_EXPORT PageMargins {
  public:
   PageMargins();
 
@@ -32,7 +33,7 @@
 
 // Settings that define the size and printable areas of a page. Unit is
 // unspecified.
-class PageSetup {
+class PRINTING_EXPORT PageSetup {
  public:
   PageSetup();
   ~PageSetup();