[presubmit] Enable readability/namespace linter checking.

src/compilation-dependencies.h

 // Copyright 2015 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_DEPENDENCIES_H_
 #define V8_DEPENDENCIES_H_
 
 #include "src/handles.h"
 #include "src/objects.h"
 
@@ skipping 43 matching lines @@
  private:
   Isolate* isolate_;
   Zone* zone_;
   Handle<Foreign> object_wrapper_;
   bool aborted_;
   ZoneList<Handle<HeapObject> >* groups_[DependentCode::kGroupCount];
 
   DependentCode* Get(Handle<Object> object);
   void Set(Handle<Object> object, Handle<DependentCode> dep);
 };
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8
 
 #endif  // V8_DEPENDENCIES_H_