Fix unit test style in core/{animation,css,fetch,frame,layout,style,timing}/.

Source/core/animation/AnimationTest.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:
  *
  *     * 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 23 matching lines @@
 #include "core/animation/AnimationClock.h"
 #include "core/animation/AnimationTimeline.h"
 #include "core/animation/ElementAnimations.h"
 #include "core/animation/KeyframeEffect.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/QualifiedName.h"
 #include "platform/weborigin/KURL.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class AnimationAnimationTest : public ::testing::Test {
 protected:
-    virtual void SetUp()
+    void SetUp() override
     {
         setUpWithoutStartingTimeline();
         startTimeline();
     }
 
     void setUpWithoutStartingTimeline()
     {
         document = Document::create();
         document->animationClock().resetTimeForTesting();
         timeline = AnimationTimeline::create(document.get());
@@ skipping 808 matching lines @@
     animation->cancel();
     EXPECT_EQ(Animation::Idle, animation->playStateInternal());
     EXPECT_TRUE(std::isnan(animation->currentTime()));
     EXPECT_TRUE(std::isnan(animation->startTime()));
     animation->pause();
     EXPECT_EQ(Animation::Idle, animation->playStateInternal());
     EXPECT_TRUE(std::isnan(animation->currentTime()));
     EXPECT_TRUE(std::isnan(animation->startTime()));
 }
 
-}
+} // namespace blink