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This CL also makes its member to be stack allocated base::Value
instead of dynamic allocated one.

Bug: None
Test: Minor cleanup, no behavior changes expected.
Change-Id: I6b97497c43e7c37b6dd5481049834c3b54b9b1a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2133207
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756056}