Audit the destructors of classes derived from net::URLRequestContextGetter

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 3229f7c3d63e1dbe32b55cb256fe88616d92681b..d0caecac8319bf8209f653495dc80dfbb433c973 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -248,12 +248,14 @@ ConstructSystemRequestContext(IOThread::Globals* globals,
 class SystemURLRequestContextGetter : public net::URLRequestContextGetter {
  public:
   explicit SystemURLRequestContextGetter(IOThread* io_thread);
-  virtual ~SystemURLRequestContextGetter();
 
   // Implementation for net::UrlRequestContextGetter.
   virtual net::URLRequestContext* GetURLRequestContext();
   virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const;
 
+ protected:
+  virtual ~SystemURLRequestContextGetter();
+
  private:
   IOThread* const io_thread_;  // Weak pointer, owned by BrowserProcess.
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;