Standardize usage of virtual/override/final in content/browser/

content/browser/browser_thread_impl.cc

Index: content/browser/browser_thread_impl.cc
diff --git a/content/browser/browser_thread_impl.cc b/content/browser/browser_thread_impl.cc
index cec1477a52972b204d6d681dad9bb9e60599b39a..33bfeb951e5caf62cde0234b79d88e5bf065ef2a 100644
--- a/content/browser/browser_thread_impl.cc
+++ b/content/browser/browser_thread_impl.cc
@@ -45,26 +45,25 @@ class BrowserThreadMessageLoopProxy : public base::MessageLoopProxy {
   }
 
   // MessageLoopProxy implementation.
-  virtual bool PostDelayedTask(
-      const tracked_objects::Location& from_here,
-      const base::Closure& task, base::TimeDelta delay) override {
+  bool PostDelayedTask(const tracked_objects::Location& from_here,
+                       const base::Closure& task,
+                       base::TimeDelta delay) override {
     return BrowserThread::PostDelayedTask(id_, from_here, task, delay);
   }
 
-  virtual bool PostNonNestableDelayedTask(
-      const tracked_objects::Location& from_here,
-      const base::Closure& task,
-      base::TimeDelta delay) override {
+  bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
+                                  const base::Closure& task,
+                                  base::TimeDelta delay) override {
     return BrowserThread::PostNonNestableDelayedTask(id_, from_here, task,
                                                      delay);
   }
 
-  virtual bool RunsTasksOnCurrentThread() const override {
+  bool RunsTasksOnCurrentThread() const override {
     return BrowserThread::CurrentlyOn(id_);
   }
 
  protected:
-  virtual ~BrowserThreadMessageLoopProxy() {}
+  ~BrowserThreadMessageLoopProxy() override {}
 
  private:
   BrowserThread::ID id_;