Dismiss popups on Tab deselected

ios/chrome/browser/ui/browser_view_controller.mm

Index: ios/chrome/browser/ui/browser_view_controller.mm
diff --git a/ios/chrome/browser/ui/browser_view_controller.mm b/ios/chrome/browser/ui/browser_view_controller.mm
index 9d87e8a52851d2bca7c66075b43f8d8e0574c6b4..f803e44f8bdb489d3d8e3ea514f266254a6a7feb 100644
--- a/ios/chrome/browser/ui/browser_view_controller.mm
+++ b/ios/chrome/browser/ui/browser_view_controller.mm
@@ -3840,6 +3840,8 @@ class BrowserBookmarkModelBridge : public bookmarks::BookmarkModelObserver {
   if (!_model || !_browserState)
     return;
 
+  [self dismissPopups];

[marq (ping after 24h), 2017/03/02 06:07:40]

I can't verify that this is correct.

What are all the paths by which the BVC's chromeExecuteCommand can be called? Is
it correct in every one of those cases to dismiss popups? I don't know. 

Remember that this code path can be triggered in many different ways.

+
   switch (command) {
     case IDC_BACK:
       [[_model currentTab] goBack];