Add more missing closing namespace comments.

third_party/WebKit/Source/core/dom/DocumentStatisticsCollector.cpp

 // Copyright 2015 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 "DocumentStatisticsCollector.h"
 
 #include "core/HTMLNames.h"
 #include "core/InputTypeNames.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeComputedStyle.h"
@@ skipping 231 matching lines @@
     // Traverse the DOM tree and collect statistics.
     collectFeatures(*body, features);
     features.openGraph = hasOpenGraphArticle(*head);
 
     double elapsedTime = monotonicallyIncreasingTime() - startTime;
     Platform::current()->histogramCustomCounts("WebCore.DistillabilityUs", static_cast<int>(1e6 * elapsedTime), 1, 1000000, 50);
 
     return features;
 }
 
-}
+} // namespace blink