[presubmit] Enable readability/namespace linter checking.

test/cctest/test-heap-profiler.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1333 matching lines @@
     return --abort_count_ != 0 ? kContinue : kAbort;
   }
   int done() { return done_; }
   int total() { return total_; }
 
  private:
   int done_;
   int total_;
   int abort_count_;
 };
-}
+
+}  // namespace
 
 
 TEST(TakeHeapSnapshotAborting) {
   LocalContext env;
   v8::HandleScope scope(env->GetIsolate());
 
   v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
   const int snapshots_count = heap_profiler->GetSnapshotCount();
   TestActivityControl aborting_control(1);
   const v8::HeapSnapshot* no_snapshot =
@@ skipping 72 matching lines @@
   bool disposed_;
   int hash_;
   const char* group_label_;
   const char* label_;
   intptr_t element_count_;
   intptr_t size_;
 };
 
 
 i::List<TestRetainedObjectInfo*> TestRetainedObjectInfo::instances;
-}
+
+}  // namespace
 
 
 static const v8::HeapGraphNode* GetNode(const v8::HeapGraphNode* parent,
                                         v8::HeapGraphNode::Type type,
                                         const char* name) {
   for (int i = 0, count = parent->GetChildrenCount(); i < count; ++i) {
     const v8::HeapGraphNode* node = parent->GetChild(i)->GetToNode();
     if (node->GetType() == type && strcmp(name,
                const_cast<i::HeapEntry*>(
                    reinterpret_cast<const i::HeapEntry*>(node))->name()) == 0) {
@@ skipping 1335 matching lines @@
   map.AddRange(ToAddress(0x180), 0x80, 6U);
   map.AddRange(ToAddress(0x180), 0x80, 7U);
   CHECK_EQ(7u, map.GetTraceNodeId(ToAddress(0x180)));
   CHECK_EQ(5u, map.GetTraceNodeId(ToAddress(0x200)));
   CHECK_EQ(3u, map.size());
 
   map.Clear();
   CHECK_EQ(0u, map.size());
   CHECK_EQ(0u, map.GetTraceNodeId(ToAddress(0x400)));
 }