Standardize usage of virtual/override/final specifiers.

remoting/host/policy_hack/policy_watcher_linux.cc

Index: remoting/host/policy_hack/policy_watcher_linux.cc
diff --git a/remoting/host/policy_hack/policy_watcher_linux.cc b/remoting/host/policy_hack/policy_watcher_linux.cc
index d67b49bf6096c52cbaabba860f6d6e8c8b86fcce..f4096b8507eee865a3fc8a3a50ea3ec802d64bb6 100644
--- a/remoting/host/policy_hack/policy_watcher_linux.cc
+++ b/remoting/host/policy_hack/policy_watcher_linux.cc
@@ -54,10 +54,10 @@ class PolicyWatcherLinux : public PolicyWatcher {
         weak_factory_(this) {
   }
 
-  virtual ~PolicyWatcherLinux() {}
+  ~PolicyWatcherLinux() override {}
 
  protected:
-  virtual void StartWatchingInternal() override {
+  void StartWatchingInternal() override {
     DCHECK(OnPolicyWatcherThread());
     watcher_.reset(new base::FilePathWatcher());
 
@@ -77,7 +77,7 @@ class PolicyWatcherLinux : public PolicyWatcher {
     ScheduleFallbackReloadTask();
   }
 
-  virtual void StopWatchingInternal() override {
+  void StopWatchingInternal() override {
     DCHECK(OnPolicyWatcherThread());
 
     // Stop watching for changes to files in the policies directory.
@@ -162,7 +162,7 @@ class PolicyWatcherLinux : public PolicyWatcher {
     return policy.Pass();
   }
 
-  virtual void Reload() override {
+  void Reload() override {
     DCHECK(OnPolicyWatcherThread());
     // Check the directory time in order to see whether a reload is required.
     base::TimeDelta delay;