[presubmit] Enable readability/namespace linter checking.

src/runtime-profiler.h

 // Copyright 2012 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_RUNTIME_PROFILER_H_
 #define V8_RUNTIME_PROFILER_H_
 
 #include "src/allocation.h"
 
 namespace v8 {
@@ skipping 21 matching lines @@
  private:
   void Optimize(JSFunction* function, const char* reason);
 
   bool CodeSizeOKForOSR(Code* shared_code);
 
   Isolate* isolate_;
 
   bool any_ic_changed_;
 };
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_RUNTIME_PROFILER_H_