exo: Fix logic in |IsPhysicalKeyboardEnabled()|.

components/exo/keyboard.cc

 // Copyright 2015 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 "components/exo/keyboard.h"
 
 #include "components/exo/keyboard_delegate.h"
 #include "components/exo/keyboard_device_configuration_delegate.h"
 #include "components/exo/shell_surface.h"
 #include "components/exo/surface.h"
@@ skipping 58 matching lines @@
         event->key_code() == ui::VKEY_BACK) {
       return true;
     }
   }
 
   return false;
 }
 
 bool IsPhysicalKeyboardEnabled() {
   // The internal keyboard is enabled if maximize mode is not enabled.
-  if (WMHelper::GetInstance()->IsMaximizeModeWindowManagerEnabled())
+  if (!WMHelper::GetInstance()->IsMaximizeModeWindowManagerEnabled())
     return true;
 
   for (auto& keyboard :
        ui::InputDeviceManager::GetInstance()->GetKeyboardDevices()) {
     if (keyboard.type != ui::InputDeviceType::INPUT_DEVICE_INTERNAL)
       return true;
   }
   return false;
 }
 
@@ skipping 146 matching lines @@
     aura::Window* top_level_window = window->GetToplevelWindow();
     if (top_level_window)
       focus = ShellSurface::GetMainSurface(top_level_window);
   }
 
   return focus && delegate_->CanAcceptKeyboardEventsForSurface(focus) ? focus
                                                                       : nullptr;
 }
 
 }  // namespace exo