Roll external/abseil_cpp/ 52fad5aa0..69c468396 (17 commits)

abseil/abseil-cpp@52fad5a...69c4683

Created with:
  roll-dep external/abseil_cpp

DEPS

@@ -3,7 +3,7 @@ use_relative_paths = True
 vars = {
   'github': 'https://github.com',
 
-  'abseil_revision': '52fad5aa026b6202dd8dabb5723f2ee3f604048f',
+  'abseil_revision': '69c46839620967c6ffb99b656174d1c544e60a50',
 
   'effcee_revision': '2c97e5689ed8d7ab6ae5820f884f03a601ae124b',