Revert of Moves ash content specific tests into ash_content_unittests

ash/test/ash_test_environment_default.cc

Index: ash/test/ash_test_environment_default.cc
diff --git a/ash/test/ash_test_environment_default.cc b/ash/test/ash_test_environment_default.cc
deleted file mode 100644
index f74443b20c55fd83752997dc03c8a07129b2f0ee..0000000000000000000000000000000000000000
--- a/ash/test/ash_test_environment_default.cc
+++ /dev/null
@@ -1,59 +0,0 @@
-// Copyright 2016 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_environment.h"
-
-#include "ash/test/ash_test_views_delegate.h"
-#include "base/memory/ptr_util.h"
-#include "base/message_loop/message_loop.h"
-#include "base/run_loop.h"
-#include "base/threading/sequenced_worker_pool.h"
-
-namespace ash {
-namespace test {
-namespace {
-
-class AshTestEnvironmentDefault : public AshTestEnvironment {
- public:
-  AshTestEnvironmentDefault() {}
-
-  ~AshTestEnvironmentDefault() override {
-    base::RunLoop().RunUntilIdle();
-    if (blocking_pool_) {
-      blocking_pool_->FlushForTesting();
-      blocking_pool_->Shutdown();
-      blocking_pool_ = nullptr;
-    }
-    base::RunLoop().RunUntilIdle();
-  }
-
-  // AshTestEnvironment:
-  base::SequencedWorkerPool* GetBlockingPool() override {
-    if (!blocking_pool_) {
-      const size_t kMaxNumberThreads = 3u;  // Matches that of content.
-      blocking_pool_ = new base::SequencedWorkerPool(
-          kMaxNumberThreads, "AshBlocking", base::TaskPriority::USER_VISIBLE);
-    }
-    return blocking_pool_.get();
-  }
-  std::unique_ptr<views::ViewsDelegate> CreateViewsDelegate() override {
-    return base::MakeUnique<AshTestViewsDelegate>();
-  }
-
- private:
-  base::MessageLoopForUI message_loop_;
-  scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
-
-  DISALLOW_COPY_AND_ASSIGN(AshTestEnvironmentDefault);
-};
-
-}  // namespace
-
-// static
-std::unique_ptr<AshTestEnvironment> AshTestEnvironment::Create() {
-  return base::MakeUnique<AshTestEnvironmentDefault>();
-}
-
-}  // namespace test
-}  // namespace ash