[presubmit] Enable readability/namespace linter checking.

src/types-inl.h

 // Copyright 2014 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_TYPES_INL_H_
 #define V8_TYPES_INL_H_
 
 #include "src/types.h"
 
 #include "src/factory.h"
@@ skipping 463 matching lines @@
 
 
 // static
 void HeapTypeConfig::range_set_double(i::Handle<HeapTypeConfig::Range> range,
                                       int index, double value,
                                       Isolate* isolate) {
   DCHECK(index >= 0 && index < 2);
   i::Handle<Object> number = isolate->factory()->NewNumber(value);
   range->set(index + 2, *number);
 }
-} }  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_TYPES_INL_H_