Fix memory leak in unit test

chrome/browser/component_updater/cros_component_installer_unittest.cc

 // Copyright 2017 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/component_updater/cros_component_installer.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/test/test_simple_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 69 matching lines @@
   }
 
   std::vector<std::string> GetMimeTypes() const override {
     return std::vector<std::string>();
   }
 };
 
 void install_callback(update_client::Error error) {}
 
 TEST_F(CrOSComponentInstallerTest, BPPPCompatibleCrOSComponent) {
-  auto* bppp = new BrowserProcessPlatformPart();
-  ASSERT_EQ(bppp->IsCompatibleCrOSComponent("a"), false);
-  bppp->AddCompatibleCrOSComponent("a");
-  ASSERT_EQ(bppp->IsCompatibleCrOSComponent("a"), true);
+  BrowserProcessPlatformPart bppp;
+  ASSERT_EQ(bppp.IsCompatibleCrOSComponent("a"), false);
+  bppp.AddCompatibleCrOSComponent("a");
+  ASSERT_EQ(bppp.IsCompatibleCrOSComponent("a"), true);
 }
 
 TEST_F(CrOSComponentInstallerTest, RegisterComponentFail) {
   std::unique_ptr<CrOSMockComponentUpdateService> cus =
       base::MakeUnique<CrOSMockComponentUpdateService>();
   EXPECT_CALL(*cus, RegisterComponent(testing::_)).Times(0);
   component_updater::CrOSComponent::InstallCrOSComponent(
       "a-component-not-exist", base::Bind(install_callback));
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace component_updater