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

The Google style guide states that only one of {virtual,override,final}
should be used for each declaration, since override implies virtual and
final implies both virtual and override.

This patch was automatically generated with an OS=android build using a
variation of https://codereview.chromium.org/598073004.

BUG=417463

Review URL: https://codereview.chromium.org/871293003

Cr-Commit-Position: refs/heads/master@{#314998}

gpu/command_buffer/client/gl_in_process_context.cc

@@ -68,7 +68,7 @@ class GLInProcessContextImpl
   size_t GetMappedMemoryLimit() override;
 
 #if defined(OS_ANDROID)
-  virtual scoped_refptr<gfx::SurfaceTexture> GetSurfaceTexture(
+  scoped_refptr<gfx::SurfaceTexture> GetSurfaceTexture(
       uint32 stream_id) override;
 #endif
 

gpu/command_buffer/service/stream_texture_manager_in_process_android.cc

@@ -23,23 +23,23 @@ class GLImageImpl : public gfx::GLImage {
               const base::Closure& release_callback);
 
   // implement gfx::GLImage
-  virtual void Destroy(bool have_context) override;
-  virtual gfx::Size GetSize() override;
-  virtual bool BindTexImage(unsigned target) override;
-  virtual void ReleaseTexImage(unsigned target) override;
-  virtual bool CopyTexImage(unsigned target) override;
-  virtual void WillUseTexImage() override;
-  virtual void DidUseTexImage() override {}
-  virtual void WillModifyTexImage() override {}
-  virtual void DidModifyTexImage() override {}
-  virtual bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
+  void Destroy(bool have_context) override;
+  gfx::Size GetSize() override;
+  bool BindTexImage(unsigned target) override;
+  void ReleaseTexImage(unsigned target) override;
+  bool CopyTexImage(unsigned target) override;
+  void WillUseTexImage() override;
+  void DidUseTexImage() override {}
+  void WillModifyTexImage() override {}
+  void DidModifyTexImage() override {}
+  bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                             int z_order,
                             gfx::OverlayTransform transform,
                             const gfx::Rect& bounds_rect,
                             const gfx::RectF& crop_rect) override;
 
  private:
-  virtual ~GLImageImpl();
+  ~GLImageImpl() override;
 
   scoped_refptr<gfx::SurfaceTexture> surface_texture_;
   base::Closure release_callback_;

gpu/command_buffer/tests/gl_unittests_android.cc

@@ -22,13 +22,9 @@ namespace gpu {
 
 class GLSurfaceTextureTest : public testing::Test {
  protected:
-  virtual void SetUp() override {
-    gl_.Initialize(GLManager::Options());
-  }
+  void SetUp() override { gl_.Initialize(GLManager::Options()); }
 
-  virtual void TearDown() override {
-    gl_.Destroy();
-  }
+  void TearDown() override { gl_.Destroy(); }
 
   GLManager gl_;
 };