[Ash] Only snap windows that can maximize.

ash/test/ash_test_base.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 "ash/test/ash_test_base.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/ash_switches.h"
@@ skipping 202 matching lines @@
   DisplayManagerTestApi display_manager_test_api(
       Shell::GetInstance()->display_manager());
   display_manager_test_api.UpdateDisplay(display_specs);
 }
 
 aura::Window* AshTestBase::CurrentContext() {
   return ash_test_helper_->CurrentContext();
 }
 
 aura::Window* AshTestBase::CreateTestWindowInShellWithId(int id) {
-  return CreateTestWindowInShellWithDelegate(NULL, id, gfx::Rect());
+  return CreateTestWindowInShellWithDelegate(
+      aura::test::TestWindowDelegate::CreateSelfDestroyingDelegate(),
+      id,
+      gfx::Rect());
 }
 
 aura::Window* AshTestBase::CreateTestWindowInShellWithBounds(
     const gfx::Rect& bounds) {
-  return CreateTestWindowInShellWithDelegate(NULL, 0, bounds);
+  return CreateTestWindowInShellWithDelegate(
+      aura::test::TestWindowDelegate::CreateSelfDestroyingDelegate(),
+      0,
+      bounds);
 }
 
 aura::Window* AshTestBase::CreateTestWindowInShell(SkColor color,
                                                    int id,
                                                    const gfx::Rect& bounds) {
   return CreateTestWindowInShellWithDelegate(
       new aura::test::ColorTestWindowDelegate(color), id, bounds);
 }
 
 aura::Window* AshTestBase::CreateTestWindowInShellWithDelegate(
@@ skipping 97 matching lines @@
 
 void AshTestBase::UnblockUserSession() {
   Shell::GetInstance()->session_state_delegate()->UnlockScreen();
   SetSessionStarted(true);
   SetUserAddingScreenRunning(false);
 }
 
 
 }  // namespace test
 }  // namespace ash