Warn on missing OVERRIDE/virtual everywhere, not just in header files.

net/quic/congestion_control/channel_estimator_test.cc

 // Copyright (c) 2013 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/logging.h"
 #include "net/quic/congestion_control/channel_estimator.h"
 #include "net/quic/test_tools/mock_clock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 
 class ChannelEstimatorTest : public ::testing::Test {
  protected:
-  void SetUp() {
+  virtual void SetUp() {
     srand(1234);
     packet_size_ = 1200;
     sequence_number_ = 1;
   }
 
   QuicPacketSequenceNumber sequence_number_;
   QuicByteCount packet_size_;
   MockClock send_clock_;
   MockClock receive_clock_;
   ChannelEstimator channel_estimator_;
@@ skipping 189 matching lines @@
   QuicTime::Delta mean_received_delta = initial_received_delta.Add(
       QuicTime::Delta::FromMicroseconds(
           increased_received_delta.ToMicroseconds() / 2));
 
   EXPECT_EQ(QuicBandwidth::FromBytesAndTimeDelta(packet_size_,
       mean_received_delta), estimate);
 }
 
 }  // namespace test
 }  // namespace net