Move about://-related constants from //content to //url

chrome/browser/captive_portal/captive_portal_browsertest.cc

Index: chrome/browser/captive_portal/captive_portal_browsertest.cc
diff --git a/chrome/browser/captive_portal/captive_portal_browsertest.cc b/chrome/browser/captive_portal/captive_portal_browsertest.cc
index 7a7d6dd718923bec2813b857450fb0b7b3b9e81d..67a9e3e80f5e26770d2395789faa74df0967c8b8 100644
--- a/chrome/browser/captive_portal/captive_portal_browsertest.cc
+++ b/chrome/browser/captive_portal/captive_portal_browsertest.cc
@@ -2064,7 +2064,7 @@ IN_PROC_BROWSER_TEST_F(CaptivePortalBrowserTest, DISABLED_TwoWindows) {
                                         browser()->host_desktop_type()));
   // Navigate the new browser window so it'll be shown and we can pick the
   // active window.
-  ui_test_utils::NavigateToURL(browser2, GURL(content::kAboutBlankURL));
+  ui_test_utils::NavigateToURL(browser2, GURL(url::kAboutBlankURL));
 
   // Generally, |browser2| will be the active window.  However, if the
   // original browser window lost focus before creating the new one, such as