Fix some override usage in media/

media/blink/cdm_result_promise.h

Index: media/blink/cdm_result_promise.h
diff --git a/media/blink/cdm_result_promise.h b/media/blink/cdm_result_promise.h
index ed4105c7365366a53d47fab02ab60e5f819394c1..e59ea1c102c7f672132d4c5e2fde701d2330b21e 100644
--- a/media/blink/cdm_result_promise.h
+++ b/media/blink/cdm_result_promise.h
@@ -26,13 +26,13 @@ class CdmResultPromise : public media::CdmPromiseTemplate<T...> {
  public:
   CdmResultPromise(const blink::WebContentDecryptionModuleResult& result,
                    const std::string& uma_name);
-  virtual ~CdmResultPromise();
+  ~CdmResultPromise() override;
 
   // CdmPromiseTemplate<T> implementation.
-  virtual void resolve(const T&... result) override;
-  virtual void reject(media::MediaKeys::Exception exception_code,
-                      uint32 system_code,
-                      const std::string& error_message) override;
+  void resolve(const T&... result) override;
+  void reject(media::MediaKeys::Exception exception_code,
+              uint32 system_code,
+              const std::string& error_message) override;
 
  private:
   using media::CdmPromiseTemplate<T...>::MarkPromiseSettled;