Use the update-binary in the source build for downgrade OTAs. am: fa41fb2705
am: 7302eb7dd6

* commit '7302eb7dd6bd22c6123bd0b252889732e215592e':
  Use the update-binary in the source build for downgrade OTAs.
diff --git a/target/product/core.mk b/target/product/core.mk
index d453303..abb4c05 100644
--- a/target/product/core.mk
+++ b/target/product/core.mk
@@ -33,7 +33,6 @@
     DownloadProviderUi \
     Email \
     ExactCalculator \
-    Exchange2 \
     ExternalStorageProvider \
     FusedLocation \
     InputDevices \