Revert r115276, it broke PanelDownloadTest.Download in interactive_ui_tests

chrome/browser/printing/print_preview_tab_controller.cc

Index: chrome/browser/printing/print_preview_tab_controller.cc
diff --git a/chrome/browser/printing/print_preview_tab_controller.cc b/chrome/browser/printing/print_preview_tab_controller.cc
index 3c634d9337561942424471301c2fab92d9329cbd..be62cea9a2fcf0a581abca872b34293c1d9ee49d 100644
--- a/chrome/browser/printing/print_preview_tab_controller.cc
+++ b/chrome/browser/printing/print_preview_tab_controller.cc
@@ -410,7 +410,7 @@ void PrintPreviewTabController::AddObservers(TabContentsWrapper* tab) {
                  content::Source<TabContents>(contents));
   registrar_.Add(
       this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
-      content::Source<NavigationController>(&contents->GetController()));
+      content::Source<NavigationController>(&contents->controller()));
 
   // Multiple sites may share the same RenderProcessHost, so check if this
   // notification has already been added.
@@ -430,7 +430,7 @@ void PrintPreviewTabController::RemoveObservers(TabContentsWrapper* tab) {
                     content::Source<TabContents>(contents));
   registrar_.Remove(
       this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
-      content::Source<NavigationController>(&contents->GetController()));
+      content::Source<NavigationController>(&contents->controller()));
 
   // Multiple sites may share the same RenderProcessHost, so check if this
   // notification has already been added.