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This change tweaks the templates for handling dictionaries. It does not
alter the generated code, but makes subsequent changes smaller and
therefore clearer.

Change-Id: I9bf6620fc2ca2415abaaf917130ea55b539e4c3f
Reviewed-on: https://chromium-review.googlesource.com/1241454Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594689}