Actually use mContext directly

I40e95d72c63f864131f0028c47f121463d0f6dff (Use mContext directly)
lost a needed line in a rebase

Test: Forced commit to return exception, checked that device reboots
Bug: 138952436
Merged-In: Idb7cb9a5b7c4c0d237ece9716932a260956a0109
Change-Id: I8e7484631cd76965e660544a1af9f567dc5d3a34
(cherry picked from commit c5fc5fe3266a7b01f689e2c981babadca5360836)
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 078fcef..c2482ef 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -5262,7 +5262,7 @@
             storageManager.commitChanges();
         } catch (Exception e) {
             PowerManager pm = (PowerManager)
-                     mInjector.getContext().getSystemService(Context.POWER_SERVICE);
+                     mContext.getSystemService(Context.POWER_SERVICE);
             pm.reboot("Checkpoint commit failed");
         }