[presubmit] Enable readability/namespace linter checking.

test/cctest/test-typing-reset.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.
 
 // TODO(mythria): Remove this define after this flag is turned on globally
 #define V8_IMMINENT_DEPRECATION_WARNINGS
 
 #include <stdlib.h>
 
 #include "src/v8.h"
@@ skipping 204 matching lines @@
         }
       }
       // return { geometricMean: geometricMean };
       CHECK_EXPR(ObjectLiteral, expected_type) {
         CHECK_VAR(geometricMean, expected_type);
       }
     }
   }
   CHECK_TYPES_END
 }
-}
+
+}  // namespace
 
 
 TEST(ResetTypingInfo) {
   const char test_function[] =
       "function GeometricMean(stdlib, foreign, buffer) {\n"
       "  \"use asm\";\n"
       "\n"
       "  var exp = stdlib.Math.exp;\n"
       "  var log = stdlib.Math.log;\n"
       "  var values = new stdlib.Float64Array(buffer);\n"
@@ skipping 56 matching lines @@
   TypeSetter(isolate, handles.main_zone(), root).Run();
 
   ExpressionTypeCollector(isolate, handles.main_zone(), root, &types).Run();
   CheckAllSame(types, INT32_TYPE);
 
   TypingReseter(isolate, handles.main_zone(), root).Run();
 
   ExpressionTypeCollector(isolate, handles.main_zone(), root, &types).Run();
   CheckAllSame(types, Bounds::Unbounded());
 }