Standardize usage of virtual/override/final specifiers.

remoting/protocol/channel_multiplexer_unittest.cc

Index: remoting/protocol/channel_multiplexer_unittest.cc
diff --git a/remoting/protocol/channel_multiplexer_unittest.cc b/remoting/protocol/channel_multiplexer_unittest.cc
index 51370f17a5210cba7135ceb6d35697c8ac4faf9a..37b7e897d9a0383f92fa4be78d7336971b6704f2 100644
--- a/remoting/protocol/channel_multiplexer_unittest.cc
+++ b/remoting/protocol/channel_multiplexer_unittest.cc
@@ -70,7 +70,7 @@ class ChannelMultiplexerTest : public testing::Test {
   }
 
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     // Create pair of multiplexers and connect them to each other.
     host_mux_.reset(new ChannelMultiplexer(
         host_session_.GetTransportChannelFactory(), kMuxChannelName));