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Fix ImaAdsMediaSource isTopLevelSource · 452e4deb
AdsMediaSource must be top-level. Currently the (deprecated) ImaAdsMediaSource can't be used because it prepares its contained AdsMediaSource as a child source. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=186990882
andrewlewis committed
