Bug 1709893 - Part 1: Remove unused kBrandBundleURL from DocShell, r=farre

Differential Revision: https://phabricator.services.mozilla.com/D114519

docshell/base/nsDocShell.cpp

@@ -291,7 +291,6 @@ extern mozilla::LazyLogModule gPageCacheLog;
 mozilla::LazyLogModule gSHLog("SessionHistory");
 extern mozilla::LazyLogModule gSHIPBFCacheLog;
 
-const char kBrandBundleURL[] = "chrome://branding/locale/brand.properties";
 const char kAppstringsBundleURL[] =
     "chrome://global/locale/appstrings.properties";