Switch PrintViewManager, PrintPreviewMessageHandler to use WebContentsUserData.

chrome/browser/automation/automation_provider_win.cc

Index: chrome/browser/automation/automation_provider_win.cc
diff --git a/chrome/browser/automation/automation_provider_win.cc b/chrome/browser/automation/automation_provider_win.cc
index 99bb3cb19a9ceb3dc810eb3ed94391347cf7104c..c78309429506e055438d27bf7d4029627199cdd6 100644
--- a/chrome/browser/automation/automation_provider_win.cc
+++ b/chrome/browser/automation/automation_provider_win.cc
@@ -259,8 +259,9 @@ void AutomationProvider::PrintAsync(int tab_handle) {
   if (!web_contents)
     return;
 
-  TabContents* tab_contents = TabContents::FromWebContents(web_contents);
-  tab_contents->print_view_manager()->PrintNow();
+  printing::PrintViewManager* print_view_manager =
+      printing::PrintViewManager::FromWebContents(web_contents);
+  print_view_manager->PrintNow();
 }
 
 ExternalTabContainer* AutomationProvider::GetExternalTabForHandle(int handle) {