Remove "create_run_targets" from presubmit.py.

Change-Id: I5d1913fd113a0cc3b77afcf8a07d3a70bfe8d0fe
diff --git a/presubmit.py b/presubmit.py
index 045cbb0..3ca9588 100755
--- a/presubmit.py
+++ b/presubmit.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-import os
 import subprocess
 
 
@@ -14,10 +13,6 @@
     """Test with gn."""
     out = '.presubmit/gn'
     call('gn', 'gen', out)
-
-    with open(os.path.join(out, 'args.gn'), 'a') as outs:
-        print('pw_unit_test_create_run_targets = true', file=outs)
-
     call('ninja', '-C', out)