Point Android PFQ to M59 branch

Change-Id: I435b18c501590556a17bff9e8297bde460052682
Reviewed-on: https://chromium-review.googlesource.com/489427
Reviewed-by: Bernie Thompson <bhthompson@chromium.org>
Tested-by: Grace Kihumba <gkihumba@chromium.org>
diff --git a/cbuildbot/chromeos_config.py b/cbuildbot/chromeos_config.py
index 332a907..8b1f6e4 100644
--- a/cbuildbot/chromeos_config.py
+++ b/cbuildbot/chromeos_config.py
@@ -3489,7 +3489,7 @@
       boards=['samus'],
       android_rev=constants.ANDROID_REV_LATEST,
       android_package='android-container',
-      android_import_branch='git_mnc-dr-arc-dev',
+      android_import_branch='git_mnc-dr-arc-m59',
       afdo_generate=True,
       afdo_update_ebuild=True,
       chrome_rev=constants.CHROME_REV_STICKY,