Fix IOBuffer leak in CertificateResourceHandler and StreamResourceHandler.

content/browser/loader/stream_resource_handler.cc

Index: content/browser/loader/stream_resource_handler.cc
diff --git a/content/browser/loader/stream_resource_handler.cc b/content/browser/loader/stream_resource_handler.cc
index 82fc9c63a98e352bf818f47f841a30138d9b28a0..564165929add133bc42ebc86fde5c88993b4d602 100644
--- a/content/browser/loader/stream_resource_handler.cc
+++ b/content/browser/loader/stream_resource_handler.cc
@@ -88,8 +88,8 @@ bool StreamResourceHandler::OnReadCompleted(int request_id,
 
   // Release the ownership of the buffer, and store a reference
   // to it. A new one will be allocated in OnWillRead().
-  net::IOBuffer* buffer = NULL;
-  read_buffer_.swap(&buffer);
+  scoped_refptr<net::IOBuffer> buffer;
+  read_buffer_.swap(buffer);
   stream_->AddData(buffer, bytes_read);
 
   if (!stream_->can_add_data())