Make android's run_instrumentation_suite() use generated wrapper scripts

scripts/slave/recipe_modules/webrtc/steps.py

Index: scripts/slave/recipe_modules/webrtc/steps.py
diff --git a/scripts/slave/recipe_modules/webrtc/steps.py b/scripts/slave/recipe_modules/webrtc/steps.py
index 0bdef8a89dfa7e55eb115b9220878848e62be053..d2cae71d333a8f12839338e529613b4607e5227e 100644
--- a/scripts/slave/recipe_modules/webrtc/steps.py
+++ b/scripts/slave/recipe_modules/webrtc/steps.py
@@ -137,14 +137,10 @@ class AndroidInstrumentationTest(Test):
   """Installs the APK on the device and runs the test."""
   def __init__(self, name, test_config):
     super(AndroidInstrumentationTest, self).__init__(name)
-    self._apk_under_test = test_config.get('apk_under_test')
-    self._test_apk = test_config.get('test_apk')
 
   def run(self, api, suffix):
     api.m.chromium_android.run_instrumentation_suite(
         name=self._name,
-        apk_under_test=api.m.chromium_android.apk_path(self._apk_under_test),
-        test_apk=api.m.chromium_android.apk_path(self._test_apk),
         tool=get_android_tool(api),
         verbose=True)