libyuv: Don't run libyuv_unittest for GN bots.

scripts/slave/recipes/libyuv/libyuv.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Recipe for building and running tests for Libyuv stand-alone.
 """
 
 from recipe_engine.types import freeze
 
@@ skipping 777 matching lines @@
     api.chromium.apply_config('trybot_flavor')
 
   api.bot_update.ensure_checkout(force=True)
   api.chromium.runhooks()
 
   if api.chromium.c.project_generator.tool == 'gn':
     api.chromium.run_gn(use_goma=True)
     api.chromium.compile(targets=['all'])
   else:
     api.chromium.compile()
-
-  if api.chromium.c.TARGET_PLATFORM in ('win', 'mac', 'linux'):
-    api.chromium.runtest('libyuv_unittest')
+    if api.chromium.c.TARGET_PLATFORM in ('win', 'mac', 'linux'):
+      api.chromium.runtest('libyuv_unittest')
 
 
 def _sanitize_nonalpha(text):
   return ''.join(c if c.isalnum() else '_' for c in text.lower())
 
 
 def GenTests(api):
   def generate_builder(mastername, buildername, revision, suffix=None):
     suffix = suffix or ''
     bot_config = BUILDERS[mastername]['builders'][buildername]
@@ skipping 23 matching lines @@
 
   # Forced builds (not specifying any revision) and test failures.
   mastername = 'client.libyuv'
   yield generate_builder(mastername, 'Linux64 Debug', revision=None,
                          suffix='_forced')
   yield generate_builder(mastername, 'Android Debug', revision=None,
                          suffix='_forced')
 
   yield generate_builder('tryserver.libyuv', 'linux', revision=None,
                          suffix='_forced')