Revert "Merge pull request #157 from SunilMohanAdapa/fix-session-browser-screenshots"

This reverts commit 6c741be, reversing
changes made to 2446326.

Author: mpasternak

pytest_splinter/plugin.py

@@ -467,8 +467,15 @@ def _browser_screenshot_session(
     if not splinter_session_scoped_browser:
         return
 
-    for name in request.fixturenames:
-        value = request.getfixturevalue(name)
+    fixture_values = (
+        # pytest 3
+        getattr(request, "_fixture_values", {})
+        or
+        # pytest 2
+        getattr(request, "_funcargs", {})
+    )
+
+    for name, value in fixture_values.items():
         should_take_screenshot = (
             hasattr(value, "__splinter_browser__")
             and splinter_make_screenshot_on_failure