Print Preview: Fixing behavior of event listeners.

chrome/browser/printing/print_preview_message_handler.h

Index: chrome/browser/printing/print_preview_message_handler.h
diff --git a/chrome/browser/printing/print_preview_message_handler.h b/chrome/browser/printing/print_preview_message_handler.h
index ff56b011ab8e717efe1d98bf22af317f8154c92a..11bc8a0fa7726db6675c59ffd8b93985ea179817 100644
--- a/chrome/browser/printing/print_preview_message_handler.h
+++ b/chrome/browser/printing/print_preview_message_handler.h
@@ -8,6 +8,7 @@
 
 #include "content/browser/tab_contents/tab_contents_observer.h"
 
+struct PrintHostMsg_DidGetPreviewPageCount_Params;
 struct PrintHostMsg_DidPreviewDocument_Params;
 struct PrintHostMsg_DidPreviewPage_Params;
 
@@ -31,9 +32,8 @@ class PrintPreviewMessageHandler : public TabContentsObserver {
 
   // Message handlers.
   void OnRequestPrintPreview();
-  void OnDidGetPreviewPageCount(int document_cookie,
-                                int page_count,
-                                bool is_modifiable);
+  void OnDidGetPreviewPageCount(
+      const PrintHostMsg_DidGetPreviewPageCount_Params& params);
   // |page_number| is 0-based.
   void OnDidPreviewPage(const PrintHostMsg_DidPreviewPage_Params& params);
   void OnPagesReadyForPreview(