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

chrome/browser/profiles/profile_io_data.cc

Index: chrome/browser/profiles/profile_io_data.cc
diff --git a/chrome/browser/profiles/profile_io_data.cc b/chrome/browser/profiles/profile_io_data.cc
index 38401252ba492750dcacb32add0bd7f50b70bd1b..91bb08014f4a4de0ec5fb10ec4096b3cdee38a8a 100644
--- a/chrome/browser/profiles/profile_io_data.cc
+++ b/chrome/browser/profiles/profile_io_data.cc
@@ -262,7 +262,8 @@ ProfileIOData::ProfileIOData(bool is_incognito)
     : initialized_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(
           resource_context_(new ResourceContext(this))),
-      initialized_on_UI_thread_(false) {
+      initialized_on_UI_thread_(false),
+      is_incognito_(is_incognito) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 }
 
@@ -525,6 +526,7 @@ void ProfileIOData::ApplyProfileParamsToContext(
 void ProfileIOData::ShutdownOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   enable_referrers_.Destroy();
+  enable_metrics_.Destroy();
   clear_local_state_on_exit_.Destroy();
   safe_browsing_enabled_.Destroy();
   session_startup_pref_.Destroy();