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Also migrated off base::DictionaryValue.

Bug: internal b/156555613
Merge-With: eureka-internal/514526
Merge-With: eureka-internal/514525
Merge-With: eureka-internal/514524
Merge-With: eureka-internal/514186
Merge-With: eureka-internal/513401
Merge-With: eureka-internal/513298
Merge-With: eureka-internal/513381
Merge-With: eureka-internal/513294
Merge-With: eureka-internal/513296
Merge-With: eureka-internal/513299
Test: cast_base_unittests
Change-Id: If06e412cd0d8eab2374e6567a87832d6a225d9a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612108
Commit-Queue: Junbo Ke <juke@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846411}