Remove 'use_swarming_recipe_to_trigger' from V8 recipe module

We've enabled 'swarming' recipe module on all builders now. This is no longer necessary.

Bug: 894045
Change-Id: Ib5011163fd2e2d74ee3e9509b39138316ab94cd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/build/+/2508091
Auto-Submit: Ye Kuang <yekuang@google.com>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Junji Watanabe <jwata@google.com>
diff --git a/recipes/recipe_modules/v8/testing.py b/recipes/recipe_modules/v8/testing.py
index 40a84c9..b20b4d6 100644
--- a/recipes/recipe_modules/v8/testing.py
+++ b/recipes/recipe_modules/v8/testing.py
@@ -426,7 +426,7 @@
   if attrs.get('priority'):
     task.request = task.request.with_priority(attrs['priority'])
 
-  api.chromium_swarming.trigger_task(task, use_swarming_recipe_to_trigger=True)
+  api.chromium_swarming.trigger_task(task)
 
 
 class V8SwarmingTest(V8Test):