GitLab

POD members of RequestContentScript::ScriptData weren't being initialized,
which a) is really bad because who knows what they might have been, and b)
is bad because it makes Dr. Memory unhappy.  Fix it (and pull ScriptData into
the .cc while we're at it).

BUG=409865

Review URL: https://codereview.chromium.org/531823002

Cr-Commit-Position: refs/heads/master@{#292960}