Standardize usage of virtual/override/final in net/

net/dns/mapped_host_resolver.h

Index: net/dns/mapped_host_resolver.h
diff --git a/net/dns/mapped_host_resolver.h b/net/dns/mapped_host_resolver.h
index 6d4ab92a33c372feb4fe9adda50925b82e2aa025..ecdc2e8adbfa0f4a8a32cffd6f5e58de4233154e 100644
--- a/net/dns/mapped_host_resolver.h
+++ b/net/dns/mapped_host_resolver.h
@@ -23,7 +23,7 @@ class NET_EXPORT MappedHostResolver : public HostResolver {
   // Creates a MappedHostResolver that forwards all of its requests through
   // |impl|.
   explicit MappedHostResolver(scoped_ptr<HostResolver> impl);
-  virtual ~MappedHostResolver();
+  ~MappedHostResolver() override;
 
   // Adds a rule to this mapper. The format of the rule can be one of:
   //
@@ -45,19 +45,19 @@ class NET_EXPORT MappedHostResolver : public HostResolver {
   }
 
   // HostResolver methods:
-  virtual int Resolve(const RequestInfo& info,
-                      RequestPriority priority,
-                      AddressList* addresses,
-                      const CompletionCallback& callback,
-                      RequestHandle* out_req,
-                      const BoundNetLog& net_log) override;
-  virtual int ResolveFromCache(const RequestInfo& info,
-                               AddressList* addresses,
-                               const BoundNetLog& net_log) override;
-  virtual void CancelRequest(RequestHandle req) override;
-  virtual void SetDnsClientEnabled(bool enabled) override;
-  virtual HostCache* GetHostCache() override;
-  virtual base::Value* GetDnsConfigAsValue() const override;
+  int Resolve(const RequestInfo& info,
+              RequestPriority priority,
+              AddressList* addresses,
+              const CompletionCallback& callback,
+              RequestHandle* out_req,
+              const BoundNetLog& net_log) override;
+  int ResolveFromCache(const RequestInfo& info,
+                       AddressList* addresses,
+                       const BoundNetLog& net_log) override;
+  void CancelRequest(RequestHandle req) override;
+  void SetDnsClientEnabled(bool enabled) override;
+  HostCache* GetHostCache() override;
+  base::Value* GetDnsConfigAsValue() const override;
 
  private:
   // Modify the request |info| according to |rules_|. Returns either OK or