Consolidate two IsArcWindow functions to reduce code duplication

chrome/browser/memory/tab_manager_delegate_chromeos_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/memory/tab_manager_delegate_chromeos.h"
 
-#include <algorithm>
 #include <map>
 #include <string>
 #include <vector>
 
-#include "ash/shell.h"
-#include "ash/test/ash_test_base.h"
-#include "base/logging.h"
-#include "base/memory/weak_ptr.h"
 #include "base/process/process_handle.h"
-#include "chrome/browser/chromeos/arc/process/arc_process.h"
-#include "chrome/browser/memory/tab_manager.h"
-#include "chrome/browser/memory/tab_stats.h"
-#include "chrome/common/url_constants.h"
 #include "chromeos/dbus/fake_debug_daemon_client.h"
-#include "components/arc/common/process.mojom.h"
-#include "components/exo/shell_surface.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include "ui/aura/window.h"
-#include "ui/wm/public/activation_client.h"
-#include "url/gurl.h"
 
 namespace memory {
 
 class TabManagerDelegateTest : public testing::Test {
  public:
   TabManagerDelegateTest() {}
   ~TabManagerDelegateTest() override {}
 
  private:
   content::TestBrowserThreadBundle thread_bundle_;
@@ skipping 414 matching lines @@
 
   // Check that killed apps are in the map.
   const TabManagerDelegate::KilledArcProcessesMap& processes_map =
       tab_manager_delegate.recently_killed_arc_processes_;
   EXPECT_EQ(2U, processes_map.size());
   EXPECT_EQ(1U, processes_map.count("service"));
   EXPECT_EQ(1U, processes_map.count("not-visible"));
 }
 
 }  // namespace memory