Docserver: Add 'deprecated since' message for API nodes

chrome/common/extensions/docs/server2/availability_finder.py

Index: chrome/common/extensions/docs/server2/availability_finder.py
diff --git a/chrome/common/extensions/docs/server2/availability_finder.py b/chrome/common/extensions/docs/server2/availability_finder.py
index b1c98529d2170c9306a7202d2edc81c7b08063d5..6be0b3be8c882347e01786eba64b0ceb3e09f089 100644
--- a/chrome/common/extensions/docs/server2/availability_finder.py
+++ b/chrome/common/extensions/docs/server2/availability_finder.py
@@ -185,7 +185,7 @@ class AvailabilityFinder(object):
       # The _api_features.json file first appears in version 28 and should be
       # the most reliable for finding API availability.
       available_channel = _GetChannelFromAPIFeatures(api_name,
-                                                          features_bundle)
+                                                     features_bundle)
     if version >= _ORIGINAL_FEATURES_MIN_VERSION:
       # The _permission_features.json and _manifest_features.json files are
       # present in Chrome 20 and onwards. Use these if no information could be