[presubmit] Enable readability/namespace linter checking.

src/char-predicates-inl.h

 // Copyright 2011 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_CHAR_PREDICATES_INL_H_
 #define V8_CHAR_PREDICATES_INL_H_
 
 #include "src/char-predicates.h"
 
 namespace v8 {
@@ skipping 67 matching lines @@
   switch (c) {
     //   CR           LF           LS           PS
     case 0x000A: case 0x000D: case 0x2028: case 0x2029:
       return false;
     default:
       return true;
   }
 }
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_CHAR_PREDICATES_INL_H_