Add the "virtual" keyword on method overrides that are missing it.

webkit/glue/plugins/plugin_stream_url.h

 // Copyright (c) 2010 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 WEBKIT_GLUE_PLUGIN_PLUGIN_STREAM_URL_H__
 #define WEBKIT_GLUE_PLUGIN_PLUGIN_STREAM_URL_H__
 
 
 #include "webkit/glue/plugins/plugin_stream.h"
 #include "webkit/glue/plugins/webplugin.h"
@@ skipping 25 matching lines @@
 
   virtual webkit_glue::WebPluginResourceClient* AsResourceClient() {
     return static_cast<webkit_glue::WebPluginResourceClient*>(this);
   }
 
   virtual void CancelRequest();
 
   //
   // WebPluginResourceClient methods
   //
-  void WillSendRequest(const GURL& url, int http_status_code);
-  void DidReceiveResponse(const std::string& mime_type,
-                          const std::string& headers,
-                          uint32 expected_length,
-                          uint32 last_modified,
-                          bool request_is_seekable);
-  void DidReceiveData(const char* buffer, int length, int data_offset);
-  void DidFinishLoading();
-  void DidFail();
-  bool IsMultiByteResponseExpected() {
-    return seekable();
-  }
-  int ResourceId() {
-    return id_;
-  }
+  virtual void WillSendRequest(const GURL& url, int http_status_code);
+  virtual void DidReceiveResponse(const std::string& mime_type,
+                                  const std::string& headers,
+                                  uint32 expected_length,
+                                  uint32 last_modified,
+                                  bool request_is_seekable);
+  virtual void DidReceiveData(const char* buffer, int length, int data_offset);
+  virtual void DidFinishLoading();
+  virtual void DidFail();
+  virtual bool IsMultiByteResponseExpected();
+  virtual int ResourceId();
 
  private:
   GURL url_;
   unsigned long id_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginStreamUrl);
 };
 
 } // namespace NPAPI
 
 #endif // WEBKIT_GLUE_PLUGIN_PLUGIN_STREAM_URL_H__