Reset browser.check_default_browser to true when Chrome is the user's default browser

chrome/browser/ui/webui/options/browser_options_handler.cc

Index: chrome/browser/ui/webui/options/browser_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/browser_options_handler.cc b/chrome/browser/ui/webui/options/browser_options_handler.cc
index def5b1f84f983a5e6f6214ec171efc993915c014..8380a89a8fcefd9ecaa682230a78deaffef2eac9 100644
--- a/chrome/browser/ui/webui/options/browser_options_handler.cc
+++ b/chrome/browser/ui/webui/options/browser_options_handler.cc
@@ -1149,6 +1149,10 @@ void BrowserOptionsHandler::SetDefaultWebClientUIState(
 
   if (state == ShellIntegration::STATE_IS_DEFAULT) {
     status_string_id = IDS_OPTIONS_DEFAULTBROWSER_DEFAULT;
+    // Notify the user in the future if Chrome ceases to be the user's chosen
+    // default browser.
+    PrefService* prefs = Profile::FromWebUI(web_ui())->GetPrefs();
+    prefs->SetBoolean(prefs::kCheckDefaultBrowser, true);
   } else if (state == ShellIntegration::STATE_NOT_DEFAULT) {
     if (ShellIntegration::CanSetAsDefaultBrowser() ==
             ShellIntegration::SET_DEFAULT_NOT_ALLOWED) {