GitLab

context_group_ has a memory tracker, which can be constructed if not
on webview.

Change-Id: I89fee9e7f96a5503a4db4b838c45a64c066fc6e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1951579Reviewed-by: Peng Huang <penghuang@chromium.org>
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Kramer Ge <fangzhoug@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722482}