Standardize usage of virtual/override/final specifiers in base/.

base/memory/discardable_memory_manager_unittest.cc

 // Copyright 2014 The Chromium 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 "base/memory/discardable_memory_manager.h"
 
 #include "base/bind.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 15 matching lines @@
     return was_allocated;
   }
   void ReleaseLock() override {
     DCHECK(is_locked_);
     is_locked_ = false;
   }
   void Purge() override {
     DCHECK(is_allocated_);
     is_allocated_ = false;
   }
-  virtual bool IsMemoryResident() const override {
+  bool IsMemoryResident() const override {
     DCHECK(is_allocated_);
     return true;
   }
 
   bool is_locked() const { return is_locked_; }
 
  private:
   bool is_allocated_;
   bool is_locked_;
 };
@@ skipping 406 matching lines @@
   Unregister(&allocation[2]);
 }
 
 class ThreadedDiscardableMemoryManagerTest
     : public DiscardableMemoryManagerTest {
  public:
   ThreadedDiscardableMemoryManagerTest()
       : memory_usage_thread_("memory_usage_thread"),
         thread_sync_(true, false) {}
 
-  virtual void SetUp() override { memory_usage_thread_.Start(); }
+  void SetUp() override { memory_usage_thread_.Start(); }
 
-  virtual void TearDown() override { memory_usage_thread_.Stop(); }
+  void TearDown() override { memory_usage_thread_.Stop(); }
 
   void UseMemoryHelper() {
     size_t size = 1024;
     TestAllocationImpl allocation;
     RegisterAndLock(&allocation, size);
     Unlock(&allocation);
     Unregister(&allocation);
   }
 
   void SignalHelper() { thread_sync_.Signal(); }
 
   Thread memory_usage_thread_;
   WaitableEvent thread_sync_;
 };
 
 TEST_F(ThreadedDiscardableMemoryManagerTest, UseMemoryOnThread) {
   memory_usage_thread_.message_loop()->PostTask(
       FROM_HERE,
       Bind(&ThreadedDiscardableMemoryManagerTest::UseMemoryHelper,
            Unretained(this)));
   memory_usage_thread_.message_loop()->PostTask(
       FROM_HERE,
       Bind(&ThreadedDiscardableMemoryManagerTest::SignalHelper,
            Unretained(this)));
   thread_sync_.Wait();
 }
 
 }  // namespace
 }  // namespace base