[presubmit] Enable readability/namespace linter checking.

src/regexp/jsregexp-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_REGEXP_JSREGEXP_INL_H_
 #define V8_REGEXP_JSREGEXP_INL_H_
 
 #include "src/allocation.h"
 #include "src/handles.h"
@@ skipping 60 matching lines @@
 int32_t* RegExpImpl::GlobalCache::LastSuccessfulMatch() {
   int index = current_match_index_ * registers_per_match_;
   if (num_matches_ == 0) {
     // After a failed match we shift back by one result.
     index -= registers_per_match_;
   }
   return &register_array_[index];
 }
 
 
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_REGEXP_JSREGEXP_INL_H_