Index: chrome/browser/io_thread.cc |
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc |
index a97a732defdbac634cb85249a145f97c75aaafe9..c8fe59e5dc3a3a6ceb6f3a7079fe948aafd025af 100644 |
--- a/chrome/browser/io_thread.cc |
+++ b/chrome/browser/io_thread.cc |
@@ -1172,7 +1172,8 @@ void IOThread::ConfigureQuicGlobals( |
std::string quic_user_agent_id = |
chrome::VersionInfo::GetVersionStringModifier(); |
- quic_user_agent_id.append(1, ' '); |
+ if (!quic_user_agent_id.empty()) |
+ quic_user_agent_id.push_back(' '); |
chrome::VersionInfo version_info; |
quic_user_agent_id.append(version_info.ProductNameAndVersionForUserAgent()); |
globals->quic_user_agent_id.set(quic_user_agent_id); |