Bug 1459089 - Don't use OS Locale when resistFingerprinting is enabled. When the OS Locale is used, it leaks the OS language in the HTTP Accept-Language header. r=mcomella

--HG--
extra : rebase_source : 7b0dc69be25c5076696a6bd9db7611cd5b0abbad

mobile/android/chrome/content/browser.js

@@ -2162,6 +2162,13 @@ var BrowserApp = {
       appLocale = appLocale.toLowerCase();
     }
 
+    try {
+        const resistFingerprinting = Services.prefs.getBoolPref("privacy.resistFingerprinting");
+        if (resistFingerprinting) {
+          osLocale = null;
+        }
+    } catch (e) {}
+
     if (osLocale) {
       osLocale = osLocale.toLowerCase();
     }