Replace some hidden API/constant usages with public/system alternatives.

Test: basic sanity
Bug: 137202333
Merged-in: I32559848ad812ad42d931f5e6d3488ceec9dcb8d
Change-Id: I32559848ad812ad42d931f5e6d3488ceec9dcb8d
(cherry picked from commit b8f132016ce71382ebe154e909589f04942d0a6b)
diff --git a/src/com/android/phone/EmergencyInfoGroup.java b/src/com/android/phone/EmergencyInfoGroup.java
index f5aca7f..a62edfd 100644
--- a/src/com/android/phone/EmergencyInfoGroup.java
+++ b/src/com/android/phone/EmergencyInfoGroup.java
@@ -209,7 +209,7 @@
     public void onClick(View view) {
         if (view.getId() == R.id.emergency_info_view) {
             AccessibilityManager accessibilityMgr =
-                    (AccessibilityManager) mContext.getSystemService(
+                    (AccessibilityManager) getContext().getSystemService(
                             Context.ACCESSIBILITY_SERVICE);
             if (accessibilityMgr.isTouchExplorationEnabled()) {
                 if (mOnConfirmClickListener != null) {