Fix IOBuffer leak in CertificateResourceHandler and StreamResourceHandler.

As found in https://crbug.com/361440#c9.

BUG=none

Review URL: https://codereview.chromium.org/232843003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263047 0039d316-1c4b-4281-b951-d872f2087c98

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));
 

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())