Standardize usage of virtual/override/final in content/browser/

content/browser/compositor/software_output_device_mac.h

Index: content/browser/compositor/software_output_device_mac.h
diff --git a/content/browser/compositor/software_output_device_mac.h b/content/browser/compositor/software_output_device_mac.h
index 393ac9b4ad7dd1e830f80a302324a67dd9572f6d..4721c61881e70e2b8b11e14230a6107d2a9c7621 100644
--- a/content/browser/compositor/software_output_device_mac.h
+++ b/content/browser/compositor/software_output_device_mac.h
@@ -20,9 +20,9 @@ namespace content {
 class SoftwareOutputDeviceMac : public cc::SoftwareOutputDevice {
  public:
   explicit SoftwareOutputDeviceMac(ui::Compositor* compositor);
-  virtual ~SoftwareOutputDeviceMac();
+  ~SoftwareOutputDeviceMac() override;
 
-  virtual void EndPaint(cc::SoftwareFrameData* frame_data) override;
+  void EndPaint(cc::SoftwareFrameData* frame_data) override;
 
  private:
   ui::Compositor* compositor_;