Don't clear controller_ in ExtensionInstalledBubbleView::CloseBubble.

chrome/browser/ui/views/extensions/extension_installed_bubble_view.cc

Index: chrome/browser/ui/views/extensions/extension_installed_bubble_view.cc
diff --git a/chrome/browser/ui/views/extensions/extension_installed_bubble_view.cc b/chrome/browser/ui/views/extensions/extension_installed_bubble_view.cc
index 85331a2314e33042bda8588e73a22e6ae9e7ca33..f5202d99cc40de4d1bdee5d6f817520b7c19d090 100644
--- a/chrome/browser/ui/views/extensions/extension_installed_bubble_view.cc
+++ b/chrome/browser/ui/views/extensions/extension_installed_bubble_view.cc
@@ -157,7 +157,9 @@ void ExtensionInstalledBubbleView::UpdateAnchorView() {
 }
 
 void ExtensionInstalledBubbleView::CloseBubble() {
-  if (controller_ && controller_->anchor_position() ==
+  // This function should only be called once.
+  CHECK(!GetWidget()->IsClosed());
+  if (controller_->anchor_position() ==
       ExtensionInstalledBubble::ANCHOR_PAGE_ACTION) {
     BrowserView* browser_view =
         BrowserView::GetBrowserViewForBrowser(browser());
@@ -166,7 +168,6 @@ void ExtensionInstalledBubbleView::CloseBubble() {
             ->GetPageAction(*controller_->extension()),
         false);  // preview_enabled
   }
-  controller_ = nullptr;
   GetWidget()->Close();
 }