Roll Flutter from fc78b77b5a40 to faab7f81ea27 (1 revision) (#1656)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 400c48f..5de6ff2 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-fc78b77b5a40b79c5629d4f77ca05fd0c44afd8b
+faab7f81ea277e118c7d5e9d542310b5351a3453