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

Source/core/css/invalidation/DescendantInvalidationSetTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/invalidation/DescendantInvalidationSet.h"
 
 #include <gtest/gtest.h>
 
-using namespace blink;
-
-namespace {
+namespace blink {
 
 // Once we setWholeSubtreeInvalid, we should not keep the HashSets.
 TEST(DescendantInvalidationSetTest, SubtreeInvalid_AddBefore)
 {
     RefPtrWillBeRawPtr<DescendantInvalidationSet> set = DescendantInvalidationSet::create();
     set->addClass("a");
     set->setWholeSubtreeInvalid();
 
     ASSERT_TRUE(set->isEmpty());
 }
@@ skipping 49 matching lines @@
 }
 
 #ifndef NDEBUG
 TEST(DescendantInvalidationSetTest, ShowDebug)
 {
     RefPtrWillBeRawPtr<DescendantInvalidationSet> set = DescendantInvalidationSet::create();
     set->show();
 }
 #endif // NDEBUG
 
-} // namespace
+} // namespace blink