[presubmit] Enable readability/namespace linter checking.

src/profiler/heap-profiler.h

Index: src/profiler/heap-profiler.h
diff --git a/src/profiler/heap-profiler.h b/src/profiler/heap-profiler.h
index b304f388ffadc7dc1e583e188bbb74efb6cbeaeb..d6fcbbdaca7e60d9d78e026d7ff44e76bba156ed 100644
--- a/src/profiler/heap-profiler.h
+++ b/src/profiler/heap-profiler.h
@@ -79,6 +79,7 @@ class HeapProfiler {
   base::Mutex profiler_mutex_;
 };
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_PROFILER_HEAP_PROFILER_H_