Standardize usage of virtual/override/final in cc/

cc/output/gl_renderer.cc

Index: cc/output/gl_renderer.cc
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index e8a2c9dbcca8b7ca2d04714088f2869a56b64b1f..61d233a4a7f17a26960ffc0e45cacfb4c9b1192e 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -56,8 +56,8 @@ class FallbackFence : public ResourceProvider::Fence {
       : gl_(gl), has_passed_(true) {}
 
   // Overridden from ResourceProvider::Fence:
-  virtual void Set() override { has_passed_ = false; }
-  virtual bool HasPassed() override {
+  void Set() override { has_passed_ = false; }
+  bool HasPassed() override {
     if (!has_passed_) {
       has_passed_ = true;
       Synchronize();
@@ -66,7 +66,7 @@ class FallbackFence : public ResourceProvider::Fence {
   }
 
  private:
-  virtual ~FallbackFence() {}
+  ~FallbackFence() override {}
 
   void Synchronize() {
     TRACE_EVENT0("cc", "FallbackFence::Synchronize");
@@ -251,16 +251,14 @@ class GLRenderer::SyncQuery {
         : query_(query) {}
 
     // Overridden from ResourceProvider::Fence:
-    virtual void Set() override {
+    void Set() override {
       DCHECK(query_);
       query_->Set();
     }
-    virtual bool HasPassed() override {
-      return !query_ || !query_->IsPending();
-    }
+    bool HasPassed() override { return !query_ || !query_->IsPending(); }
 
    private:
-    virtual ~Fence() {}
+    ~Fence() override {}
 
     base::WeakPtr<SyncQuery> query_;