Add more missing closing namespace comments.

third_party/WebKit/Source/core/fetch/MemoryCacheTest.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 519 matching lines @@
     EXPECT_TRUE(memoryCache()->contains(resource3.get()));
 
     WillBeHeapVector<RawPtrWillBeMember<Resource>> resources = memoryCache()->resourcesForURL(url);
     EXPECT_EQ(2u, resources.size());
 
     memoryCache()->evictResources();
     EXPECT_FALSE(memoryCache()->contains(resource1.get()));
     EXPECT_FALSE(memoryCache()->contains(resource3.get()));
 }
 
-} // namespace
+} // namespace blink