chromium_tests: make IsolatedScript use run_isolated directly, not runtest

scripts/slave/recipe_modules/isolate/api.py

Index: scripts/slave/recipe_modules/isolate/api.py
diff --git a/scripts/slave/recipe_modules/isolate/api.py b/scripts/slave/recipe_modules/isolate/api.py
index a896d851ae363de75193bf525c959d553d603f7e..68c65cae6b0d4b4111b4a6e33224b8dcaf317d79 100644
--- a/scripts/slave/recipe_modules/isolate/api.py
+++ b/scripts/slave/recipe_modules/isolate/api.py
@@ -213,7 +213,7 @@ class IsolateApi(recipe_api.RecipeApi):
       full_args.extend(args)
     return full_args
 
-  def run_isolated(self, name, isolate_hash, args=None):
+  def run_isolated(self, name, isolate_hash, args=None, **kwargs):
     """Runs an isolated test."""
     cmd = [
         '--isolated', isolate_hash,
@@ -223,7 +223,7 @@ class IsolateApi(recipe_api.RecipeApi):
     if args:
       cmd.append('--')
       cmd.extend(args)
-    self.m.python(name, self._run_isolated_path, cmd)
+    self.m.python(name, self._run_isolated_path, cmd, **kwargs)
 
   def runtest(self, test, revision, webkit_revision, args=None, name=None,
               **runtest_kwargs):