athena: Remove ActivityViewModel::CreateWidget().

athena/content/app_activity_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 "athena/activity/public/activity_factory.h"
 #include "athena/activity/public/activity_manager.h"
 #include "athena/content/app_activity.h"
 #include "athena/content/app_activity_registry.h"
 #include "athena/content/public/app_registry.h"
 #include "athena/extensions/public/extensions_delegate.h"
@@ skipping 43 matching lines @@
     current_state_ = state;
     if (state == ACTIVITY_UNLOADED)
       app_activity_registry_->Unload();
   }
   ActivityState GetCurrentState() override { return current_state_; }
   bool IsVisible() override { return true; }
   ActivityMediaState GetMediaState() override {
     return Activity::ACTIVITY_MEDIA_STATE_NONE;
   }
   aura::Window* GetWindow() override {
-    return view_->GetWidget()->GetNativeWindow();
+    return view_->GetWidget() ? view_->GetWidget()->GetNativeWindow() : nullptr;
   }
 
   // ActivityViewModel:
   void Init() override {}
   SkColor GetRepresentativeColor() const override { return 0; }
   base::string16 GetTitle() const override { return title_; }
   bool UsesFrame() const override { return true; }
   views::View* GetContentsView() override { return view_; }
-  views::Widget* CreateWidget() override { return nullptr; }
   gfx::ImageSkia GetOverviewModeImage() override { return gfx::ImageSkia(); }
 
  private:
   // If known the registry which holds all activities for the associated app.
   AppActivityRegistry* app_activity_registry_;
 
   // The title of the activity.
   base::string16 title_;
 
   // Our view.
@@ skipping 339 matching lines @@
   // However - the restart in this test framework does not really restart and
   // all objects should be still there..
   EXPECT_EQ(1, AppRegistry::Get()->NumberOfApplications());
   EXPECT_TRUE(app_activity_registry->unloaded_activity_proxy());
   Activity::Delete(app_activity_registry->unloaded_activity_proxy());
   EXPECT_EQ(0, AppRegistry::Get()->NumberOfApplications());
 }
 
 }  // namespace test
 }  // namespace athena