Add user agent string to feedback reports.

chrome/browser/feedback/feedback_util.cc

Index: chrome/browser/feedback/feedback_util.cc
diff --git a/chrome/browser/feedback/feedback_util.cc b/chrome/browser/feedback/feedback_util.cc
index b19f53d3882957724476b84ad3f8b299ff62fd59..5e3c4cef29385fa59db07fcd120e4d5b3c0bbb0e 100644
--- a/chrome/browser/feedback/feedback_util.cc
+++ b/chrome/browser/feedback/feedback_util.cc
@@ -26,6 +26,7 @@
 #include "chrome/common/chrome_version_info.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/content_client.h"
 #include "googleurl/src/gurl.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
@@ -263,6 +264,10 @@ void FeedbackUtil::SendReport(
   userfeedback::CommonData* common_data = feedback_data.mutable_common_data();
   userfeedback::WebData* web_data = feedback_data.mutable_web_data();
 
+  // Set our user agent.
+  userfeedback::Navigator* navigator = web_data->mutable_navigator();
+  navigator->set_user_agent(content::GetUserAgent(GURL()));
+
   // Set GAIA id to 0. We're not using gaia id's for recording
   // use feedback - we're using the e-mail field, allows users to
   // submit feedback from incognito mode and specify any mail id