GitLab

Delegate to the embedder the decision to filter URLs to add to the history
through the HistoryClient defaulting to registering all URLs (in the base
class implementation but also when there is no HistoryClient during tests).

BUG=390953
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/971423002

Cr-Commit-Position: refs/heads/master@{#319071}