[presubmit] Enable readability/namespace linter checking.

src/heap/scavenge-job.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/heap/scavenge-job.h"
 
 #include "src/base/platform/time.h"
 #include "src/heap/heap-inl.h"
 #include "src/heap/heap.h"
 #include "src/isolate.h"
@@ skipping 94 matching lines @@
 void ScavengeJob::ScheduleIdleTask(Heap* heap) {
   if (!idle_task_pending_) {
     v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(heap->isolate());
     if (V8::GetCurrentPlatform()->IdleTasksEnabled(isolate)) {
       idle_task_pending_ = true;
       auto task = new IdleTask(heap->isolate(), this);
       V8::GetCurrentPlatform()->CallIdleOnForegroundThread(isolate, task);
     }
   }
 }
-}
-}  // namespace v8::internal
+}  // namespace internal
+}  // namespace v8