Standardize usage of virtual/override/final specifiers.

components/component_updater/test/crx_downloader_unittest.cc

Index: components/component_updater/test/crx_downloader_unittest.cc
diff --git a/components/component_updater/test/crx_downloader_unittest.cc b/components/component_updater/test/crx_downloader_unittest.cc
index 9dbe8fe992fc2f5b617e569245957bfee174a737..ebc8d6011b66b3f26111fe2770a244139c5e7c14 100644
--- a/components/component_updater/test/crx_downloader_unittest.cc
+++ b/components/component_updater/test/crx_downloader_unittest.cc
@@ -40,11 +40,11 @@ base::FilePath MakeTestFilePath(const char* file) {
 class CrxDownloaderTest : public testing::Test {
  public:
   CrxDownloaderTest();
-  virtual ~CrxDownloaderTest();
+  ~CrxDownloaderTest() override;
 
   // Overrides from testing::Test.
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
   void Quit();
   void RunThreads();