Cache the application context instead of Activity.

When storing a reference to a Context, ensure that it's the
Application context rather than Activity Context.

Bug: 5084293

Change-Id: Ib0be5f8ceb91846bb985d0813a8f22cabd44eaf8
diff --git a/src/com/android/browser/AutofillHandler.java b/src/com/android/browser/AutofillHandler.java
index b6b237d..c4b14d7 100644
--- a/src/com/android/browser/AutofillHandler.java
+++ b/src/com/android/browser/AutofillHandler.java
@@ -42,7 +42,7 @@
     private Context mContext;
 
     public AutofillHandler(Context context) {
-        mContext = context;
+        mContext = context.getApplicationContext();
     }
 
     /**