Change the conditions on which the popup blocked animation is shown to be more reliable.

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
diff --git a/chrome/browser/tab_contents/tab_contents.cc b/chrome/browser/tab_contents/tab_contents.cc
index b22c2f8c9c62a07ae0f1fdc470b3823fed0c8a6f..70aab9efe66c48dd1872589b63196614766b52ed 100644
--- a/chrome/browser/tab_contents/tab_contents.cc
+++ b/chrome/browser/tab_contents/tab_contents.cc
@@ -1022,8 +1022,6 @@ void TabContents::PopupNotificationVisibilityChanged(bool visible) {
   content_settings_delegate_->SetPopupsBlocked(visible);
   if (!dont_notify_render_view_)
     render_view_host()->AllowScriptToClose(!visible);
-  if (visible)
-    PopupBlockedAnimation::Show(this);
 }
 
 gfx::NativeView TabContents::GetContentNativeView() const {
@@ -1526,6 +1524,8 @@ void TabContents::AddPopup(TabContents* new_contents,
     blocked_popups_->AddTabContents(new_contents, initial_pos);
     content_settings_delegate_->OnContentBlocked(CONTENT_SETTINGS_TYPE_POPUPS,
                                                  std::string());
+    if (!is_being_destroyed())
+      PopupBlockedAnimation::Show(this);
   }
 }