Add more missing closing namespace comments.

third_party/WebKit/Source/core/layout/PaintContainmentTest.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 "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/paint/PaintLayer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 32 matching lines @@
 {
     setBodyInnerHTML("<div><span id='test' style='contain: paint'>Foo</span></div>");
     Element* span = document().getElementById(AtomicString("test"));
     ASSERT(span);
     LayoutObject* obj = span->layoutObject();
     ASSERT(obj && obj->isInline());
     LayoutInline& layoutInline = toLayoutInline(*obj);
     checkIsClippingStackingContextAndContainer(layoutInline);
 }
 
-}
+} // namespace blink