Remove a graceful shutdown sequence from TestingPlatformSupport

third_party/WebKit/Source/platform/testing/TestingPlatformSupport.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 250 matching lines @@
 
     ProcessHeap::init();
     ThreadState::attachMainThread();
     ThreadState::current()->registerTraceDOMWrappers(nullptr, nullptr, nullptr);
     EventTracer::initialize();
     HTTPNames::init();
 }
 
 ScopedUnittestsEnvironmentSetup::~ScopedUnittestsEnvironmentSetup()
 {
-    blink::ThreadState::detachMainThread();
-    blink::ProcessHeap::shutdown();
-
-    // Destroy test platform objects before shutting down WTF layer.
-    m_testingPlatformSupport.reset();
-    m_compositorSupport.reset();
-
-    WTF::shutdown();
-    WTF::Partitions::shutdown();
-
-    // Now - implicitly destroy m_platform and m_discardableMemoryAllocator.
 }
 
 } // namespace blink