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

Source/core/animation/animatable/AnimatableNeutralTest.cpp

Index: Source/core/animation/animatable/AnimatableNeutralTest.cpp
diff --git a/Source/core/animation/animatable/AnimatableNeutralTest.cpp b/Source/core/animation/animatable/AnimatableNeutralTest.cpp
index bdcfe45cd8ac5fb5984c855fc65af6ff2dd1fc5d..dfec141c8b501f02b608dc5f5bf9e0eb1cccf374 100644
--- a/Source/core/animation/animatable/AnimatableNeutralTest.cpp
+++ b/Source/core/animation/animatable/AnimatableNeutralTest.cpp
@@ -33,13 +33,11 @@
 
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 TEST(AnimationAnimatableNeutralTest, Create)
 {
     EXPECT_TRUE(AnimatableValue::neutralValue());
 }
 
-}
+} // namespace blink