Fix IOBuffer leak in CertificateResourceHandler and StreamResourceHandler.

content/browser/loader/certificate_resource_handler.cc

Index: content/browser/loader/certificate_resource_handler.cc
diff --git a/content/browser/loader/certificate_resource_handler.cc b/content/browser/loader/certificate_resource_handler.cc
index 4545f346fad594c10ae9e672e9b61fa706fe8c34..3c39599f5b1a602c447c9093cba7a2e7e8d1c111 100644
--- a/content/browser/loader/certificate_resource_handler.cc
+++ b/content/browser/loader/certificate_resource_handler.cc
@@ -91,8 +91,8 @@ bool CertificateResourceHandler::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);
   // TODO(gauravsh): Should this be handled by a separate thread?
   buffer_.push_back(std::make_pair(buffer, bytes_read));