Bug 1532402 - Part 4: Pass a docshell pointer to nsContentUtils::ShouldResistFingerprinting() for Navigator.maxTouchPoints; r=baku

Depends on D21992

Differential Revision: https://phabricator.services.mozilla.com/D21993

--HG--
extra : moz-landing-system : lando

dom/base/Navigator.cpp

@@ -792,7 +792,7 @@ uint32_t Navigator::MaxTouchPoints(CallerType aCallerType) {
   // The maxTouchPoints is going to reveal the detail of users' hardware. So,
   // we will spoof it into 0 if fingerprinting resistance is on.
   if (aCallerType != CallerType::System &&
-      nsContentUtils::ShouldResistFingerprinting()) {
+      nsContentUtils::ShouldResistFingerprinting(GetDocShell())) {
     return 0;
   }