Use chromium version for data reduction proxy version

components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
index 3f1565684a729c2da104c692fa1197b957c28f9f..70460c5e751a12c3c75f9bcb509d65a8ca29d519 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.cc
@@ -15,6 +15,7 @@
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_settings.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_headers.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_switches.h"
+#include "components/data_reduction_proxy/common/version.h"
 #include "crypto/random.h"
 #include "net/proxy/proxy_server.h"
 #include "net/url_request/url_request.h"
@@ -34,6 +35,15 @@ const char kClientChromeAndroid[] = "android";
 const char kClientChromeIOS[] = "ios";
 
 // static
+std::string DataReductionProxyAuthRequestHandler::ChromiumVersion() {
+#if defined(PRODUCT_VERSION)
+  return PRODUCT_VERSION;
+#else
+  return std::string();
+#endif
+}
+
+// static
 bool DataReductionProxyAuthRequestHandler::IsKeySetOnCommandLine() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   return command_line.HasSwitch(