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/AccountsChangedReceiver.java b/src/com/android/browser/AccountsChangedReceiver.java
index cad176f..ba1b3cc 100644
--- a/src/com/android/browser/AccountsChangedReceiver.java
+++ b/src/com/android/browser/AccountsChangedReceiver.java
@@ -46,7 +46,7 @@
     static class DeleteRemovedAccounts extends Thread {
         Context mContext;
         public DeleteRemovedAccounts(Context context) {
-            mContext = context;
+            mContext = context.getApplicationContext();
         }
 
         @Override