Roll GN from 6feb5599..a5bcbd72

    a5bcbd72 Update default VS to 2019
    ff241a58 Update Rust example to match modern gn needs.
    56246794 Fix quoting preprocessor defines for compilation database

Bug: 1038361
Change-Id: I74a864e0d4ec41bae0795353a30e2c032a580c14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1984714
Reviewed-by: Peter Kasting <[email protected]>
Reviewed-by: Nico Weber <[email protected]>
Auto-Submit: Aaron Gable <[email protected]>
Commit-Queue: Nico Weber <[email protected]>
Cr-Commit-Position: refs/heads/master@{#727848}
diff --git a/DEPS b/DEPS
index b52e57d81..0a6f0ee 100644
--- a/DEPS
+++ b/DEPS
@@ -337,7 +337,7 @@
   # revisions.
 
   # GN CIPD package version.
-  'gn_version': 'git_revision:6feb55993083dfd27b93da195c8a82a3a9529848',
+  'gn_version': 'git_revision:a5bcbd726ac7bd342ca6ee3e3a006478fd1f00b5',
 
   # Also, if you change these, update buildtools/DEPS too. Also update the
   # libc++ svn_revision in //buildtools/deps_revisions.gni.