Instrument "Remove this person" in user manager.

chrome/browser/profiles/profile_metrics.h

Index: chrome/browser/profiles/profile_metrics.h
diff --git a/chrome/browser/profiles/profile_metrics.h b/chrome/browser/profiles/profile_metrics.h
index 8feb60fe2f48c3a876b2d7e0db070a4fc38ce104..75f0e601be35e955e33d24c18eed4e14f02cbb4b 100644
--- a/chrome/browser/profiles/profile_metrics.h
+++ b/chrome/browser/profiles/profile_metrics.h
@@ -48,8 +48,14 @@ class ProfileMetrics {
   };
 
   enum ProfileDelete {
-    DELETE_PROFILE_SETTINGS = 0,  // Delete profile from settings page.
-    DELETE_PROFILE_USER_MANAGER,  // Delete profile from User Manager.
+    // Delete profile from settings page.
+    DELETE_PROFILE_SETTINGS = 0,
+    // Delete profile from User Manager.
+    DELETE_PROFILE_USER_MANAGER,
+    // Show the delete profile warning in the User Manager.
+    DELETE_PROFILE_USER_MANAGER_SHOW_WARNING,
+    // Show the delete profile warning in the Settings page.
+    DELETE_PROFILE_SETTINGS_SHOW_WARNING,
     NUM_DELETE_PROFILE_METRICS
   };