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This change alters the code that is generated for dictionaries to use
Chromium variable names.

Change-Id: I5db361a1ef41dd134b2a2bf2e9af2cae14d17ad0
Reviewed-on: https://chromium-review.googlesource.com/1247232Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595367}