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in hacker_case.

When the type name is in hacker_case, generate HackerCase as the class
name instead of Hacker_case.

BUG=1113513

Change-Id: Ie94419b088a8c5de9434a2f6bcb962ca0a1a20cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360508
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799867}