Minimized windows should not be activated by another user in multiprofile scenario.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index dc081c6fc359aba744fdf4c1c1020099b65bc638..5bc8f681519d0588b5d584aeb2fa238d2b845605 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -89,6 +89,9 @@ class SessionStateDelegateImpl : public SessionStateDelegate {
       aura::Window* window) override {
     return Shell::GetInstance()->delegate()->GetActiveBrowserContext();
   }
+  const std::string& GetUserPresentingWindow(aura::Window* window) override {
+    return base::EmptyString();
+  }
   int GetMaximumNumberOfLoggedInUsers() const override { return 3; }
   int NumberOfLoggedInUsers() const override {
     // ash_shell has 2 users.