Adds NavigationManager util functions to ios/chrome/browser/web/

ios/chrome/browser/tabs/tab.mm

Index: ios/chrome/browser/tabs/tab.mm
diff --git a/ios/chrome/browser/tabs/tab.mm b/ios/chrome/browser/tabs/tab.mm
index 7cbcff399c1da0581aadd62b0a1a1e515e391eaa..d6d50234183cc1cef80f0395ec2b463e2de65fd8 100644
--- a/ios/chrome/browser/tabs/tab.mm
+++ b/ios/chrome/browser/tabs/tab.mm
@@ -105,6 +105,7 @@
 #include "ios/chrome/browser/ui/ui_util.h"
 #import "ios/chrome/browser/web/auto_reload_bridge.h"
 #import "ios/chrome/browser/web/external_app_launcher.h"
+#include "ios/chrome/browser/web/navigation_manager_util.h"

[Eugene But (OOO till 7-30), 2017/03/17 14:32:04]

s/include/import

[pkl (ping after 24h if needed), 2017/03/17 20:23:52]

Done.

 #import "ios/chrome/browser/web/passkit_dialog_provider.h"
 #include "ios/chrome/browser/web/print_observer.h"
 #import "ios/chrome/browser/xcallback_parameters.h"
@@ -1508,16 +1509,16 @@ void TabInfoBarObserver::OnInfoBarReplaced(infobars::InfoBar* old_infobar,
   ui::PageTransition transition =
       ui::PageTransitionFromInt(ui::PAGE_TRANSITION_FORM_SUBMIT);
   DCHECK([self navigationManager]);
-  CRWSessionController* sessionController =
-      [self navigationManagerImpl]->GetSessionController();
-  web::NavigationItem* lastUserItem = [sessionController lastUserItem];
+  web::NavigationItem* lastUserItem =

[Eugene But (OOO till 7-30), 2017/03/17 14:32:04]

nit: s/lastUserItem/lastNonRedirectedItem ?

[pkl (ping after 24h if needed), 2017/03/17 20:23:52]

Done.

+      GetLastNonRedirectedItem([self navigationManager]);
   if (!lastUserItem)
     return;
 
   // |originalUrl| will be empty if a page was open by DOM.
   GURL reloadURL(lastUserItem->GetOriginalRequestURL());
   if (reloadURL.is_empty()) {
-    DCHECK(sessionController.openedByDOM);
+    DCHECK(
+        [[self navigationManagerImpl]->GetSessionController() isOpenedByDOM]);
     reloadURL = lastUserItem->GetVirtualURL();
   }