GitLab

BUG=364560
Test=This changes the internals of rendering <webview> in chrome-apps. No noticeable changes should be observed.

Review URL: https://codereview.chromium.org/251593004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266797 0039d316-1c4b-4281-b951-d872f2087c98