Standardize usage of virtual/override/final in cc/

cc/layers/layer_impl_unittest.cc

Index: cc/layers/layer_impl_unittest.cc
diff --git a/cc/layers/layer_impl_unittest.cc b/cc/layers/layer_impl_unittest.cc
index 3f5ff5e21a51a0cafb1881739ea296524b24a248..8d120bef621d19b9f40f424451858278f6ed743b 100644
--- a/cc/layers/layer_impl_unittest.cc
+++ b/cc/layers/layer_impl_unittest.cc
@@ -497,12 +497,11 @@ TEST_F(LayerImplScrollTest, ScrollByWithNonZeroOffset) {
 
 class ScrollDelegateIgnore : public LayerImpl::ScrollOffsetDelegate {
  public:
-  virtual void SetTotalScrollOffset(
-      const gfx::ScrollOffset& new_value) override {}
-  virtual gfx::ScrollOffset GetTotalScrollOffset() override {
+  void SetTotalScrollOffset(const gfx::ScrollOffset& new_value) override {}
+  gfx::ScrollOffset GetTotalScrollOffset() override {
     return gfx::ScrollOffset(fixed_offset_);
   }
-  virtual bool IsExternalFlingActive() const override { return false; }
+  bool IsExternalFlingActive() const override { return false; }
 
   void set_fixed_offset(const gfx::Vector2dF& fixed_offset) {
     fixed_offset_ = fixed_offset;
@@ -547,14 +546,11 @@ TEST_F(LayerImplScrollTest, ScrollByWithIgnoringDelegate) {
 
 class ScrollDelegateAccept : public LayerImpl::ScrollOffsetDelegate {
  public:
-  virtual void SetTotalScrollOffset(
-      const gfx::ScrollOffset& new_value) override {
+  void SetTotalScrollOffset(const gfx::ScrollOffset& new_value) override {
     current_offset_ = new_value;
   }
-  virtual gfx::ScrollOffset GetTotalScrollOffset() override {
-    return current_offset_;
-  }
-  virtual bool IsExternalFlingActive() const override { return false; }
+  gfx::ScrollOffset GetTotalScrollOffset() override { return current_offset_; }
+  bool IsExternalFlingActive() const override { return false; }
 
  private:
   gfx::ScrollOffset current_offset_;