Remove incorrect language indicating that URLRequest was dependent on SDCHOwner.
Remove incorrect language indicating that URLRequest was dependent on SDCHOwner.

BUG=None

Review URL: https://codereview.chromium.org/1514113002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#364386}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk