Remove disabled permutation from run_on_app.py

Change-Id: I2bb2d075d665109a3284ca858f02dba12e0d4557
diff --git a/tools/run_on_app.py b/tools/run_on_app.py
index 14310b6..1e3d292 100755
--- a/tools/run_on_app.py
+++ b/tools/run_on_app.py
@@ -215,8 +215,7 @@
 # Please add bug number for disabled permutations and please explicitly
 # do Bug: #BUG in the commit message of disabling to ensure re-enabling
 DISABLED_PERMUTATIONS = [
-  # (app, version, type), e.g., ('gmail', '180826.15', 'deploy'),
-  ('youtube', '15.09', 'deploy'), # b/150267318
+  # (app, version, type), e.g., ('gmail', '180826.15', 'deploy')
 ]
 
 def get_permutations():