Remove now-unusd inspector settings methods in WebView.
Remove now-unusd inspector settings methods in WebView.

TBR=abarth
BUG=399506

Review URL: https://codereview.chromium.org/468103004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@180797 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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