Remove unused constant.

Change-Id: Ib9203857c82c9da6ff345afd153fbb59867c781b
(cherry picked from commit 10c0088f01c8c72aba465d8cb5724ee1c6ae7933)
diff --git a/src/com/android/exchange/service/EmailSyncAdapterService.java b/src/com/android/exchange/service/EmailSyncAdapterService.java
index 8192df6..c7e9bf5 100644
--- a/src/com/android/exchange/service/EmailSyncAdapterService.java
+++ b/src/com/android/exchange/service/EmailSyncAdapterService.java
@@ -95,11 +95,6 @@
     /** Controls whether we do a periodic "kick" to restart the ping. */
     private static final boolean SCHEDULE_KICK = true;
 
-    /**
-     * If sync extras do not include a mailbox id, then we want to perform a full sync.
-     */
-    private static final long FULL_ACCOUNT_SYNC = Mailbox.NO_MAILBOX;
-
     /** Projection used for getting email address for an account. */
     private static final String[] ACCOUNT_EMAIL_PROJECTION = { AccountColumns.EMAIL_ADDRESS };