Fix unit test style in Source/platform/, part 1.

Source/platform/LifecycleContextTest.cpp

 /*
  * Copyright (C) 2013 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 #include "config.h"
 
 #include "platform/LifecycleNotifier.h"
 #include "platform/LifecycleObserver.h"
 #include "platform/heap/Handle.h"
-
 #include <gtest/gtest.h>
 
-using namespace blink;
-
 namespace blink {
 
 class TestingObserver;
 
 class DummyContext final : public NoBaseWillBeGarbageCollectedFinalized<DummyContext>, public LifecycleNotifier<DummyContext, TestingObserver> {
 public:
     static PassOwnPtrWillBeRawPtr<DummyContext> create()
     {
         return adoptPtrWillBeNoop(new DummyContext());
     }
 
     DEFINE_INLINE_TRACE()
     {
         LifecycleNotifier<DummyContext, TestingObserver>::trace(visitor);
     }
 };
 
 class TestingObserver final : public NoBaseWillBeGarbageCollectedFinalized<TestingObserver>, public LifecycleObserver<DummyContext, TestingObserver, DummyContext> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(TestingObserver);
 public:
     static PassOwnPtrWillBeRawPtr<TestingObserver> create(DummyContext* context)
     {
         return adoptPtrWillBeNoop(new TestingObserver(context));
     }
 
-    virtual void contextDestroyed() override
+    void contextDestroyed() override
     {
         LifecycleObserver::contextDestroyed();
         if (m_observerToRemoveOnDestruct) {
             lifecycleContext()->removeObserver(m_observerToRemoveOnDestruct.get());
             m_observerToRemoveOnDestruct.clear();
         }
         m_contextDestroyedCalled = true;
     }
 
     DEFINE_INLINE_TRACE()
@@ skipping 68 matching lines @@
 
     context->notifyContextDestroyed();
     EXPECT_EQ(observer->innerObserver(), nullptr);
     context = nullptr;
     Heap::collectAllGarbage();
     EXPECT_EQ(observer->lifecycleContext(), static_cast<DummyContext*>(0));
     EXPECT_TRUE(observer->contextDestroyedCalled());
 }
 
 } // namespace blink