replace OVERRIDE and FINAL with override and final in chrome/browser/extensions/

chrome/browser/extensions/startup_helper.cc

Index: chrome/browser/extensions/startup_helper.cc
diff --git a/chrome/browser/extensions/startup_helper.cc b/chrome/browser/extensions/startup_helper.cc
index 36f427cc253a110d4850d65e9545c8066757d0a2..e9b33cbf646cc9cf07d53b49cce50ec197f8ecf1 100644
--- a/chrome/browser/extensions/startup_helper.cc
+++ b/chrome/browser/extensions/startup_helper.cc
@@ -144,7 +144,7 @@ class ValidateCrxHelper : public SandboxedUnpackerClient {
                                const base::FilePath& extension_root,
                                const base::DictionaryValue* original_manifest,
                                const Extension* extension,
-                               const SkBitmap& install_icon) OVERRIDE {
+                               const SkBitmap& install_icon) override {
     finished_ = true;
     success_ = true;
     BrowserThread::PostTask(BrowserThread::UI,
@@ -153,7 +153,7 @@ class ValidateCrxHelper : public SandboxedUnpackerClient {
                                        this));
   }
 
-  virtual void OnUnpackFailure(const base::string16& error) OVERRIDE {
+  virtual void OnUnpackFailure(const base::string16& error) override {
     finished_ = true;
     success_ = false;
     error_ = error;