Fixed issue with shrink output when using system print dialog.

chrome/renderer/print_web_view_helper.cc

Index: chrome/renderer/print_web_view_helper.cc
===================================================================
--- chrome/renderer/print_web_view_helper.cc	(revision 132045)
+++ chrome/renderer/print_web_view_helper.cc	(working copy)
@@ -665,7 +665,8 @@
       fit_to_page_(true),
       user_cancelled_scripted_print_count_(0),
       is_scripted_printing_blocked_(false),
-      notify_browser_of_print_failure_(true) {
+      notify_browser_of_print_failure_(true),
+      printing_from_preview_(false) {
 }
 
 PrintWebViewHelper::~PrintWebViewHelper() {}
@@ -751,10 +752,12 @@
   }
 
   // Render Pages for printing.
+  printing_from_preview_ = true;
   if (!RenderPagesForPrint(pdf_frame, pdf_element)) {
     LOG(ERROR) << "RenderPagesForPrint failed";
     DidFinishPrinting(FAIL_PRINT);
   }
+  printing_from_preview_ = false;
 }
 
 bool PrintWebViewHelper::GetPrintFrame(WebKit::WebFrame** frame) {