Standardize usage of virtual/override/final specifiers.

content/browser/gpu/shader_disk_cache_unittest.cc

Index: content/browser/gpu/shader_disk_cache_unittest.cc
diff --git a/content/browser/gpu/shader_disk_cache_unittest.cc b/content/browser/gpu/shader_disk_cache_unittest.cc
index 46855d52b494e5d1ba025dfdd5b153cd27b6d217..15894ef6713a963170ef153d97026aec5bc56c18 100644
--- a/content/browser/gpu/shader_disk_cache_unittest.cc
+++ b/content/browser/gpu/shader_disk_cache_unittest.cc
@@ -25,7 +25,7 @@ class ShaderDiskCacheTest : public testing::Test {
       : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP) {
   }
 
-  virtual ~ShaderDiskCacheTest() {}
+  ~ShaderDiskCacheTest() override {}
 
   const base::FilePath& cache_path() { return temp_dir_.path(); }
 
@@ -36,7 +36,7 @@ class ShaderDiskCacheTest : public testing::Test {
   }
 
  private:
-  virtual void TearDown() override {
+  void TearDown() override {
     ShaderCacheFactory::GetInstance()->RemoveCacheInfo(kDefaultClientId);
   }