message: Fix iteration over remaining items in pgmap
  Summary:
  We were using `itervalues()`, which just gets the values, when we
  really wanted (key, value) pairs.
diff: @@ -283,8 +283,7 @@ def update_proguard_mapping_file(pg_map, redex_map, output_file):
  print(line.rstrip(), file=output)
  else:
  print(line.rstrip(), file=output)
  - if len(redex_dict) != 0:
  - for unmangled, mangled in redex_dict.itervalues():
  + for unmangled, mangled in redex_dict.iteritems():
  print('%s -> %s:' % (unmangled, mangled), file=output)
  