ContentCapture: Remove the way to use smart pointer to retrieve content

Replaced cc::NodeHolder with cc::NodeId

Bug: 939886
Change-Id: Ic4aa24947ae878bc69ba856c900063488bd19395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1700372
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679426}
65 files changed