Update ChromeWebContentHandler browser comment.

Updates a comment on why request is not handled when browser cannot be
initialized.

Bug: 1141608
Change-Id: If6e79905e7242902bebe3b1918c15a9b913bf27b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560502Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830952}

chrome/browser/ui/webui/chrome_web_contents_handler.cc

@@ -89,12 +89,10 @@ void ChromeWebContentsHandler::AddNewContents(
   Browser* browser = chrome::FindTabbedBrowser(profile, false);
   const bool browser_created = !browser;
   if (!browser) {
-    // TODO(https://crbug.com/1141608): Remove when root cause is found.
+    // The request can be triggered by Captive portal when browser is not ready
+    // (https://crbug.com/1141608).
     if (Browser::GetBrowserCreationStatusForProfile(profile) !=
         Browser::BrowserCreationStatus::kOk) {
-      NOTREACHED() << "Browser creation status: "
-                   << static_cast<int>(
-                          Browser::GetBrowserCreationStatusForProfile(profile));
       return;
     }
     browser = Browser::Create(