[prebuilt] Update GN to version 549249

12bd7ed6ad77 [gn] Updating args --list to make the comment padding optional
743a7a884c8d Fix grammar-o in gn's help.
28f3c4987aac Implement "friend" for GN header checking.
f7ccdc763eb5 GN: Use source root as base for gn gen filters
73b7854e6d4c GN: Improve bootstrap for Windows

Change-Id: I059e20f5031a3a21c6096ff506437e1ebe27f29c
diff --git a/fuchsia.ensure b/fuchsia.ensure
index 9d454e4..2489e74 100644
--- a/fuchsia.ensure
+++ b/fuchsia.ensure
@@ -15,7 +15,7 @@
 infra/ninja/${platform} version:1.8.2
 
 # GN
-infra/tools/gn/${platform} gn_version:547759
+infra/tools/gn/${platform} gn_version:549249
 
 # godepfile
 fuchsia/tools/godepfile/${platform} git_revision:6922d7833617841e853a0be52a285f6cd07a0a10