Remove all blimp engine code

blimp/engine/app/blimp_system_url_request_context_getter_unittest.cc

-// 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 "blimp/engine/app/blimp_system_url_request_context_getter.h"
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "content/public/test/test_browser_thread_bundle.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace blimp {
-namespace engine {
-
-namespace {
-class BlimpSystemURLRequestContextGetterTest : public testing::Test {
- public:
-  BlimpSystemURLRequestContextGetterTest()
-      : system_url_request_context_getter_(
-            new BlimpSystemURLRequestContextGetter()) {}
-
- protected:
-  content::TestBrowserThreadBundle thread_bundle_;
-  scoped_refptr<BlimpSystemURLRequestContextGetter>
-      system_url_request_context_getter_;
-};
-
-TEST_F(BlimpSystemURLRequestContextGetterTest, GetURLRequestContext) {
-  ASSERT_NE(nullptr,
-            system_url_request_context_getter_->GetURLRequestContext());
-}
-
-}  // namespace
-
-}  // namespace engine
-}  // namespace blimp