Update {virtual,override} to follow C++11 style in ppapi.

ppapi/host/ppapi_host.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_HOST_PPAPI_HOST_H_
 #define PPAPI_HOST_PPAPI_HOST_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 28 matching lines @@
 // The host provides routing and tracking for resource message calls that
 // come from the plugin to the host (browser or renderer), and the
 // corresponding replies.
 class PPAPI_HOST_EXPORT PpapiHost : public IPC::Sender, public IPC::Listener {
  public:
   // The sender is the channel to the plugin for outgoing messages.
   // Normally the creator will add filters for resource creation messages
   // (AddHostFactoryFilter) and instance messages (AddInstanceMessageFilter)
   // after construction.
   PpapiHost(IPC::Sender* sender, const PpapiPermissions& perms);
-  virtual ~PpapiHost();
+  ~PpapiHost() override;
 
   const PpapiPermissions& permissions() const { return permissions_; }
 
   // Sender implementation. Forwards to the sender_.
-  virtual bool Send(IPC::Message* msg) override;
+  bool Send(IPC::Message* msg) override;
 
   // Listener implementation.
-  virtual bool OnMessageReceived(const IPC::Message& msg) override;
+  bool OnMessageReceived(const IPC::Message& msg) override;
 
   // Sends the given reply message to the plugin.
   void SendReply(const ReplyMessageContext& context,
                  const IPC::Message& msg);
 
   // Sends the given unsolicited reply message to the plugin.
   void SendUnsolicitedReply(PP_Resource resource, const IPC::Message& msg);
 
   // Similar to |SendUnsolicitedReply()|, but also sends handles.
   void SendUnsolicitedReplyWithHandles(
@@ skipping 74 matching lines @@
   PendingHostResourceMap pending_resource_hosts_;
   int next_pending_resource_host_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PpapiHost);
 };
 
 }  // namespace host
 }  // namespace ppapi
 
 #endif  // PPAPI_HOST_PPAPIE_HOST_H_