Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/error_console/error_console_browsertest.cc

Index: chrome/browser/extensions/error_console/error_console_browsertest.cc
diff --git a/chrome/browser/extensions/error_console/error_console_browsertest.cc b/chrome/browser/extensions/error_console/error_console_browsertest.cc
index 1d9e96a5c230789b738f617288adfa32e3de15af..e7857a2eb4b83e384432e5528bf545e586515657 100644
--- a/chrome/browser/extensions/error_console/error_console_browsertest.cc
+++ b/chrome/browser/extensions/error_console/error_console_browsertest.cc
@@ -154,7 +154,7 @@ class ErrorConsoleBrowserTest : public ExtensionBrowserTest {
     }
 
     // ErrorConsole::Observer implementation.
-    virtual void OnErrorAdded(const ExtensionError* error) override {
+    void OnErrorAdded(const ExtensionError* error) override {
       ++errors_observed_;
       if (errors_observed_ >= errors_expected_) {
         if (waiting_)
@@ -162,9 +162,7 @@ class ErrorConsoleBrowserTest : public ExtensionBrowserTest {
       }
     }
 
-    virtual void OnErrorConsoleDestroyed() override {
-      error_console_ = NULL;
-    }
+    void OnErrorConsoleDestroyed() override { error_console_ = NULL; }
 
     // Spin until the appropriate number of errors have been observed.
     void WaitForErrors() {
@@ -199,7 +197,7 @@ class ErrorConsoleBrowserTest : public ExtensionBrowserTest {
     ACTION_NONE
   };
 
-  virtual void SetUpInProcessBrowserTestFixture() override {
+  void SetUpInProcessBrowserTestFixture() override {
     ExtensionBrowserTest::SetUpInProcessBrowserTestFixture();
 
     // We need to enable the ErrorConsole FeatureSwitch in order to collect
@@ -209,7 +207,7 @@ class ErrorConsoleBrowserTest : public ExtensionBrowserTest {
         FeatureSwitch::OVERRIDE_ENABLED);
   }
 
-  virtual void SetUpOnMainThread() override {
+  void SetUpOnMainThread() override {
     ExtensionBrowserTest::SetUpOnMainThread();
 
     // Errors are only kept if we have Developer Mode enabled.