Update {virtual,override} to follow C++11 style in components.

components/proximity_auth/client_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 "components/proximity_auth/client.h"
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/proximity_auth/client_observer.h"
 #include "components/proximity_auth/connection.h"
@@ skipping 21 matching lines @@
 const char kFakeEncodingSuffix[] = ", but encoded";
 
 class MockSecureContext : public SecureContext {
  public:
   MockSecureContext() {
     // By default, mock a secure context that uses the 3.1 protocol. Individual
     // tests override this as needed.
     ON_CALL(*this, GetProtocolVersion())
         .WillByDefault(Return(SecureContext::PROTOCOL_VERSION_THREE_ONE));
   }
-  virtual ~MockSecureContext() {}
+  ~MockSecureContext() override {}
 
   MOCK_CONST_METHOD0(GetReceivedAuthMessage, std::string());
   MOCK_CONST_METHOD0(GetProtocolVersion, ProtocolVersion());
 
-  virtual std::string Encode(const std::string& message) override {
+  std::string Encode(const std::string& message) override {
     return message + kFakeEncodingSuffix;
   }
 
-  virtual std::string Decode(const std::string& encoded_message) override {
+  std::string Decode(const std::string& encoded_message) override {
     EXPECT_THAT(encoded_message, EndsWith(kFakeEncodingSuffix));
     std::string decoded_message = encoded_message;
     decoded_message.erase(decoded_message.rfind(kFakeEncodingSuffix));
     return decoded_message;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockSecureContext);
 };
 
@@ skipping 442 matching lines @@
       "\"data\":\"YSB3aW5uZXIgaXMgeW91\""
       "}, but encoded");
 
   // The unlock request should have remained buffered, and should only now be
   // sent.
   EXPECT_CALL(observer, OnUnlockResponse(false));
   client.GetFakeConnection()->FinishSendingMessageWithSuccess(false);
 }
 
 }  // namespace proximity_auth