Fix infinite loop causing iterator to go out of bounds.

ash/virtual_keyboard_controller_unittest.cc

 // 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 "ash/virtual_keyboard_controller.h"
 
 #include "ash/shell.h"
 #include "ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
@@ skipping 167 matching lines @@
   ASSERT_TRUE(IsVirtualKeyboardSuppressed());
   // Remove external keyboard. Should be notified that the keyboard is not
   // suppressed.
   ResetObserver();
   UpdateKeyboardDevices(std::vector<ui::KeyboardDevice>());
   ASSERT_TRUE(keyboard::IsKeyboardEnabled());
   ASSERT_TRUE(notified());
   ASSERT_FALSE(IsVirtualKeyboardSuppressed());
 }
 
+// Tests handling multiple keyboards. Catches crbug.com/430252
+TEST_F(VirtualKeyboardControllerAutoTest, HandleMultipleKeyboardsPresent) {
+  std::vector<ui::KeyboardDevice> keyboards;
+  keyboards.push_back(ui::KeyboardDevice(
+      1, ui::InputDeviceType::INPUT_DEVICE_INTERNAL, "keyboard"));
+  keyboards.push_back(ui::KeyboardDevice(
+      2, ui::InputDeviceType::INPUT_DEVICE_EXTERNAL, "keyboard"));
+  keyboards.push_back(ui::KeyboardDevice(
+      3, ui::InputDeviceType::INPUT_DEVICE_EXTERNAL, "keyboard"));
+  UpdateKeyboardDevices(keyboards);
+  ASSERT_FALSE(keyboard::IsKeyboardEnabled());
+}
+
 }  // namespace test
 }  // namespace ash