[presubmit] Enable readability/namespace linter checking.

test/cctest/expression-type-collector.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "test/cctest/expression-type-collector.h"
 
 #include "src/ast.h"
 #include "src/codegen.h"
 #include "src/scopes.h"
 
 namespace v8 {
 namespace internal {
 namespace {
 
 struct {
   AstNode::NodeType type;
   const char* name;
 } NodeTypeNameList[] = {
 #define DECLARE_VISIT(type)   \
   { AstNode::k##type, #type } \
   ,
     AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 };
-}
+
+}  // namespace
 
 
 ExpressionTypeCollector::ExpressionTypeCollector(
     Isolate* isolate, Zone* zone, FunctionLiteral* root,
     ZoneVector<ExpressionTypeEntry>* dst)
     : AstExpressionVisitor(isolate, zone, root), result_(dst) {}
 
 
 void ExpressionTypeCollector::Run() {
   result_->clear();
@@ skipping 12 matching lines @@
   AstNode::NodeType type = expression->node_type();
   e.kind = "unknown";
   for (size_t i = 0; i < arraysize(NodeTypeNameList); ++i) {
     if (NodeTypeNameList[i].type == type) {
       e.kind = NodeTypeNameList[i].name;
       break;
     }
   }
   result_->push_back(e);
 }
-}
-}
+
+}  // namespace internal
+}  // namespace v8