Instrument "Remove this person" in user manager.

chrome/browser/ui/webui/signin/user_manager_screen_handler.cc

Index: chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
diff --git a/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc b/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
index 186dd0e3fc9bae89beb4cf2ce527bfcb6605ff99..f56306539d4b1e10d370d2d47c7237b50f189148 100644
--- a/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
+++ b/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
@@ -75,6 +75,7 @@ const char kJsApiUserManagerLaunchGuest[] = "launchGuest";
 const char kJsApiUserManagerLaunchUser[] = "launchUser";
 const char kJsApiUserManagerRemoveUser[] = "removeUser";
 const char kJsApiUserManagerAttemptUnlock[] = "attemptUnlock";
+const char kJsApiUserManagerShowRemoveUserWarning[] = "showRemoveUserWarning";
 
 const size_t kAvatarIconSize = 180;
 
@@ -534,6 +535,12 @@ void UserManagerScreenHandler::HandleHardlockUserPod(
   HideUserPodCustomIcon(email);
 }
 
+void UserManagerScreenHandler::HandleShowRemoveUserWarning(
+    const base::ListValue* args) {
+  ProfileMetrics::LogProfileDeleteUser(
+      ProfileMetrics::DELETE_PROFILE_USER_MANAGER_SHOW_WARNING);
+}
+
 void UserManagerScreenHandler::OnClientLoginSuccess(
     const ClientLoginResult& result) {
   LocalAuth::SetLocalAuthCredentials(authenticating_profile_index_,
@@ -594,6 +601,9 @@ void UserManagerScreenHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback(kJsApiUserManagerAttemptUnlock,
       base::Bind(&UserManagerScreenHandler::HandleAttemptUnlock,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback(kJsApiUserManagerShowRemoveUserWarning,
+      base::Bind(&UserManagerScreenHandler::HandleShowRemoveUserWarning,
+                 base::Unretained(this)));
 
   const content::WebUI::MessageCallback& kDoNothingCallback =
       base::Bind(&HandleAndDoNothing);