Update from https://crrev.com/309717

net/base/test_completion_callback.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_BASE_TEST_COMPLETION_CALLBACK_H_
 #define NET_BASE_TEST_COMPLETION_CALLBACK_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "net/base/completion_callback.h"
@@ skipping 67 matching lines @@
 };
 
 }  // namespace internal
 
 class TestClosure
     : public internal::TestCompletionCallbackBaseInternal {
  public:
   using internal::TestCompletionCallbackBaseInternal::WaitForResult;
 
   TestClosure();
-  virtual ~TestClosure() override;
+  ~TestClosure() override;
 
   const base::Closure& closure() const { return closure_; }
 
  private:
   const base::Closure closure_;
 
   DISALLOW_COPY_AND_ASSIGN(TestClosure);
 };
 
 // Base class overridden by custom implementations of TestCompletionCallback.
 typedef internal::TestCompletionCallbackTemplate<int>
     TestCompletionCallbackBase;
 
 typedef internal::TestCompletionCallbackTemplate<int64>
     TestInt64CompletionCallbackBase;
 
 class TestCompletionCallback : public TestCompletionCallbackBase {
  public:
   TestCompletionCallback();
-  virtual ~TestCompletionCallback() override;
+  ~TestCompletionCallback() override;
 
   const CompletionCallback& callback() const { return callback_; }
 
  private:
   const CompletionCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(TestCompletionCallback);
 };
 
 class TestInt64CompletionCallback : public TestInt64CompletionCallbackBase {
  public:
   TestInt64CompletionCallback();
-  virtual ~TestInt64CompletionCallback() override;
+  ~TestInt64CompletionCallback() override;
 
   const Int64CompletionCallback& callback() const { return callback_; }
 
  private:
   const Int64CompletionCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(TestInt64CompletionCallback);
 };
 
 // Makes sure that the buffer is not referenced when the callback runs.
 class ReleaseBufferCompletionCallback: public TestCompletionCallback {
  public:
   explicit ReleaseBufferCompletionCallback(IOBuffer* buffer);
-  virtual ~ReleaseBufferCompletionCallback() override;
+  ~ReleaseBufferCompletionCallback() override;
 
  private:
   void SetResult(int result) override;
 
   IOBuffer* buffer_;
   DISALLOW_COPY_AND_ASSIGN(ReleaseBufferCompletionCallback);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_TEST_COMPLETION_CALLBACK_H_