Fix DCHECK when opening two password bubbles one after another.

chrome/browser/ui/cocoa/passwords/passwords_bubble_browsertest.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_objc_class_swizzler.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
@@ skipping 109 matching lines @@
       [controller() retain]);
   EXPECT_TRUE(bubble_controller);
   EXPECT_TRUE(view()->active());
 
   // Open the bubble again, the first one should be replaced.
   DoWithSwizzledNSWindow(^{ SetupPendingPassword(); });
   EXPECT_NSNE(bubble_controller, controller());
   EXPECT_TRUE(controller());
   EXPECT_TRUE(view()->active());
 }
+
+IN_PROC_BROWSER_TEST_F(ManagePasswordsBubbleTest, DoubleOpenDifferentBubbles) {
+  // Open the autosignin bubble first.
+  DoWithSwizzledNSWindow(^{
+    ScopedVector<autofill::PasswordForm> local_credentials;
+    local_credentials.push_back(new autofill::PasswordForm(*test_form()));
+    SetupAutoSignin(std::move(local_credentials));
+  });
+  EXPECT_TRUE(controller());
+  EXPECT_TRUE(view()->active());
+
+  // Open the save bubble. The previous one is closed twice (with and without
+  // animation). It shouldn't cause DCHECK.
+  DoWithSwizzledNSWindow(^{ SetupPendingPassword(); });
+  EXPECT_TRUE(controller());
+  EXPECT_TRUE(view()->active());
+}