Standardize usage of virtual/override/final specifiers.

gpu/command_buffer/tests/occlusion_query_unittest.cc

Index: gpu/command_buffer/tests/occlusion_query_unittest.cc
diff --git a/gpu/command_buffer/tests/occlusion_query_unittest.cc b/gpu/command_buffer/tests/occlusion_query_unittest.cc
index 7cbb1a8e4eb418139009a69e076ca9c746dee996..2f749c7797808a05e9b06af595b50a08a95c8a11 100644
--- a/gpu/command_buffer/tests/occlusion_query_unittest.cc
+++ b/gpu/command_buffer/tests/occlusion_query_unittest.cc
@@ -14,15 +14,13 @@ namespace gpu {
 
 class OcclusionQueryTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     GLManager::Options options;
     options.size = gfx::Size(512, 512);
     gl_.Initialize(options);
   }
 
-  virtual void TearDown() {
-    gl_.Destroy();
-  }
+  void TearDown() override { gl_.Destroy(); }
 
   void DrawRect(float x, float z, float scale, float* color);