Roll Flutter from 52d17b667250 to b46e07bad3c6 (1 revision) (#1525)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 6c29c6d..fc7bc4e 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-52d17b667250c6f126f0a03cec04b6a8c72dee04
+b46e07bad3c6b6be85277f3cec88a79632987be0