Standardize usage of virtual/override/final specifiers.

extensions/browser/image_loader_unittest.cc

Index: extensions/browser/image_loader_unittest.cc
diff --git a/extensions/browser/image_loader_unittest.cc b/extensions/browser/image_loader_unittest.cc
index ea409005c0b5a337d538c5c69f68217ebcf7bad7..7257ddcc11b8fb6f6feaa7bd68818c82dd0dd8ec 100644
--- a/extensions/browser/image_loader_unittest.cc
+++ b/extensions/browser/image_loader_unittest.cc
@@ -100,7 +100,7 @@ class ImageLoaderTest : public testing::Test {
   gfx::ImageFamily image_family_;
 
  private:
-  virtual void SetUp() override {
+  void SetUp() override {
     testing::Test::SetUp();
     file_thread_.Start();
     io_thread_.Start();