Roll Flutter from 7f84c5500f86 to e99a66a47ef3 (2 revisions) (#1250)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 5bca5cc..ccbd9b5 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-7f84c5500f869bdd6c2d59da717f68bf50c103f2
+e99a66a47ef32ea3ba4ca621c708ed0908124434