Standardize usage of virtual/override/final in ui/

ui/gl/gl_gl_api_implementation.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_GL_GL_GL_API_IMPLEMENTATION_H_
 #define UI_GL_GL_GL_API_IMPLEMENTATION_H_
 
 #include "base/compiler_specific.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_export.h"
@@ skipping 24 matching lines @@
 
 class GLApiBase : public GLApi {
  public:
   // Include the auto-generated part of this class. We split this because
   // it means we can easily edit the non-auto generated parts right here in
   // this file instead of having to edit some template or the code generator.
   #include "gl_bindings_api_autogen_gl.h"
 
  protected:
   GLApiBase();
-  virtual ~GLApiBase();
+  ~GLApiBase() override;
   void InitializeBase(DriverGL* driver);
   void SignalFlush();
 
   DriverGL* driver_;
 };
 
 // Implemenents the GL API by calling directly into the driver.
 class RealGLApi : public GLApiBase {
  public:
   RealGLApi();
-  virtual ~RealGLApi();
+  ~RealGLApi() override;
   void Initialize(DriverGL* driver);
 
  private:
-  virtual void glFinishFn() override;
-  virtual void glFlushFn() override;
+  void glFinishFn() override;
+  void glFlushFn() override;
 };
 
 // Inserts a TRACE for every GL call.
 class TraceGLApi : public GLApi {
  public:
   TraceGLApi(GLApi* gl_api) : gl_api_(gl_api) { }
-  virtual ~TraceGLApi();
+  ~TraceGLApi() override;
 
   // Include the auto-generated part of this class. We split this because
   // it means we can easily edit the non-auto generated parts right here in
   // this file instead of having to edit some template or the code generator.
   #include "gl_bindings_api_autogen_gl.h"
 
  private:
   GLApi* gl_api_;
 };
 
 // Catches incorrect usage when GL calls are made without a current context.
 class NoContextGLApi : public GLApi {
  public:
   NoContextGLApi();
-  virtual ~NoContextGLApi();
+  ~NoContextGLApi() override;
 
   // Include the auto-generated part of this class. We split this because
   // it means we can easily edit the non-auto generated parts right here in
   // this file instead of having to edit some template or the code generator.
   #include "gl_bindings_api_autogen_gl.h"
 };
 
 // Implementents the GL API using co-operative state restoring.
 // Assumes there is only one real GL context and that multiple virtual contexts
 // are implemented above it. Restores the needed state from the current context.
 class VirtualGLApi : public GLApiBase {
  public:
   VirtualGLApi();
-  virtual ~VirtualGLApi();
+  ~VirtualGLApi() override;
   void Initialize(DriverGL* driver, GLContext* real_context);
 
   // Sets the current virutal context.
   bool MakeCurrent(GLContext* virtual_context, GLSurface* surface);
 
   void OnReleaseVirtuallyCurrent(GLContext* virtual_context);
 
 private:
   // Overridden functions from GLApiBase
-  virtual const GLubyte* glGetStringFn(GLenum name) override;
-  virtual void glFinishFn() override;
-  virtual void glFlushFn() override;
+ const GLubyte* glGetStringFn(GLenum name) override;
+ void glFinishFn() override;
+ void glFlushFn() override;
 
   // The real context we're running on.
   GLContext* real_context_;
 
   // The current virtual context.
   GLContext* current_context_;
 
   // The supported extensions being advertised for this virtual context.
   std::string extensions_;
 };
 
 class GL_EXPORT ScopedSetGLToRealGLApi {
  public:
   ScopedSetGLToRealGLApi();
   ~ScopedSetGLToRealGLApi();
 
  private:
   GLApi* old_gl_api_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_GL_API_IMPLEMENTATION_H_