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

Source/core/animation/AnimationClockTest.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 16 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 "core/animation/AnimationClock.h"
 
 #include "wtf/OwnPtr.h"
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 class AnimationAnimationClockTest : public ::testing::Test {
 public:
     AnimationAnimationClockTest()
         : animationClock(mockTimeFunction)
     { }
+
 protected:
-    virtual void SetUp()
+    void SetUp() override
     {
         mockTime = 0;
         animationClock.resetTimeForTesting();
     }
 
     static double mockTimeFunction()
     {
         return mockTime;
     }
 
@@ skipping 75 matching lines @@
     EXPECT_EQ(100, animationClock.currentTime());
 
     mockTime = 100;
     AnimationClock::notifyTaskStart();
     EXPECT_EQ(100, animationClock.currentTime());
 
     mockTime = 150;
     EXPECT_EQ(100, animationClock.currentTime());
 }
 
-}
+} // namespace blink