[presubmit] Enable readability/namespace linter checking.

src/profiler/heap-snapshot-generator-inl.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_PROFILER_HEAP_SNAPSHOT_GENERATOR_INL_H_
 #define V8_PROFILER_HEAP_SNAPSHOT_GENERATOR_INL_H_
 
 #include "src/profiler/heap-snapshot-generator.h"
 
 namespace v8 {
@@ skipping 25 matching lines @@
 
 HeapGraphEdge** HeapEntry::children_arr() {
   DCHECK(children_index_ >= 0);
   SLOW_DCHECK(children_index_ < snapshot_->children().length() ||
       (children_index_ == snapshot_->children().length() &&
        children_count_ == 0));
   return &snapshot_->children().first() + children_index_;
 }
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_PROFILER_HEAP_SNAPSHOT_GENERATOR_INL_H_