Transmit a X-Chrome-UMA-Enabled bit to Google domains from clients that have UMA enabled.

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 1e978791dd911934ed658eaf0ebd39448120a3af..9283151dd40401e61ca89298ff968f850dea3d6a 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -385,7 +385,9 @@ void IOThread::Init() {
       NULL,
       NULL,
       NULL,
-      &system_enable_referrers_));
+      ChromeNetworkDelegate::NORMAL,
+      &system_enable_referrers_,
+      NULL));
   globals_->host_resolver.reset(
       CreateGlobalHostResolver(net_log_));
   globals_->cert_verifier.reset(net::CertVerifier::CreateDefault());