Fix null pointer dereference in FocusManager::ViewRemoved.

ui/views/focus/focus_manager.cc

Index: ui/views/focus/focus_manager.cc
diff --git a/ui/views/focus/focus_manager.cc b/ui/views/focus/focus_manager.cc
index bd6b0dc19fe4749a958afe41f8c49dd158ed446a..241acac8557273f6c2d724423072c17576be67d1 100644
--- a/ui/views/focus/focus_manager.cc
+++ b/ui/views/focus/focus_manager.cc
@@ -517,7 +517,7 @@ void FocusManager::ViewRemoved(View* removed) {
   // clear the focus.  However, it's not safe to call ClearFocus()
   // (and in turn ClearNativeFocus()) here because ViewRemoved() can
   // be called while the top level widget is being destroyed.
-  if (focused_view_ && removed->Contains(focused_view_))
+  if (focused_view_ && removed && removed->Contains(focused_view_))

[sky, 2016/06/06 16:30:45]

This code shouldn't have to check for a null supplied view. This code should
have a DCHECK(removed) and callers shouldn't supply null.

     SetFocusedView(NULL);
 }