message: Fix the logging location.
  The return value check should have been inside the block for
  `fill_incognito_candidate_words`. It doesn't affect converter behavior.
diff: @@ -527,12 +527,12 @@ bool SessionConverter::SuggestWithPreferences(
  result = converter_->StartSuggestionForRequest(
  incognito_conversion_request, incognito_segments_.get());
  }
  - }
  if (!result) {
  VLOG(1) << "Start(Partial?)SuggestionForRequest() for incognito request "
  "returned no suggestions.";
  // TODO(noriyukit): Check if fall through here is ok.
  }
  + }
  DCHECK_EQ(1, segments_->conversion_segments_size());
  // Copy current suggestions so that we can merge
  