[presubmit] Enable readability/namespace linter checking.

src/allocation-site-scopes.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ALLOCATION_SITE_SCOPES_H_
 #define V8_ALLOCATION_SITE_SCOPES_H_
 
 #include "src/ast.h"
 #include "src/handles.h"
 #include "src/objects.h"
@@ skipping 77 matching lines @@
   }
 
   bool ShouldCreateMemento(Handle<JSObject> object);
 
  private:
   Handle<AllocationSite> top_site_;
   bool activated_;
 };
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_ALLOCATION_SITE_SCOPES_H_