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

chrome/browser/task_manager/task_manager.h

Index: chrome/browser/task_manager/task_manager.h
diff --git a/chrome/browser/task_manager/task_manager.h b/chrome/browser/task_manager/task_manager.h
index 5b33c7596abc85607db067eab0e4f34435388b73..bd8ac5f005278eaa87c126a46a88e5945644490e 100644
--- a/chrome/browser/task_manager/task_manager.h
+++ b/chrome/browser/task_manager/task_manager.h
@@ -297,13 +297,16 @@ class TaskManagerModel : public URLRequestJobTracker::JobObserver,
   const Extension* GetResourceExtension(int index) const;
 
   // JobObserver methods:
-  void OnJobAdded(net::URLRequestJob* job);
-  void OnJobRemoved(net::URLRequestJob* job);
-  void OnJobDone(net::URLRequestJob* job, const URLRequestStatus& status);
-  void OnJobRedirect(net::URLRequestJob* job,
-                     const GURL& location,
-                     int status_code);
-  void OnBytesRead(net::URLRequestJob* job, const char* buf, int byte_count);
+  virtual void OnJobAdded(net::URLRequestJob* job);
+  virtual void OnJobRemoved(net::URLRequestJob* job);
+  virtual void OnJobDone(net::URLRequestJob* job,
+                         const URLRequestStatus& status);
+  virtual void OnJobRedirect(net::URLRequestJob* job,
+                             const GURL& location,
+                             int status_code);
+  virtual void OnBytesRead(net::URLRequestJob* job,
+                           const char* buf,
+                           int byte_count);
 
   void AddResourceProvider(TaskManager::ResourceProvider* provider);
   void RemoveResourceProvider(TaskManager::ResourceProvider* provider);