virtual/override specifier cleanup in content/.

content/renderer/media/crypto/renderer_cdm_manager.h

Index: content/renderer/media/crypto/renderer_cdm_manager.h
diff --git a/content/renderer/media/crypto/renderer_cdm_manager.h b/content/renderer/media/crypto/renderer_cdm_manager.h
index 4944144685d12aa0bebddb5aa8dcf512f5242df9..8ada7fdb4aefac9969fef6a8c82cb48c995c0bd5 100644
--- a/content/renderer/media/crypto/renderer_cdm_manager.h
+++ b/content/renderer/media/crypto/renderer_cdm_manager.h
@@ -28,10 +28,10 @@ class RendererCdmManager : public RenderFrameObserver {
  public:
   // Constructs a RendererCdmManager object for the |render_frame|.
   explicit RendererCdmManager(RenderFrame* render_frame);
-  virtual ~RendererCdmManager();
+  ~RendererCdmManager() override;
 
   // RenderFrameObserver overrides.
-  virtual bool OnMessageReceived(const IPC::Message& msg) override;
+  bool OnMessageReceived(const IPC::Message& msg) override;
 
   // Encrypted media related methods.
   void InitializeCdm(int cdm_id,