Remove unused runtime setting mediaplaybackallowsinline
Remove unused runtime setting mediaplaybackallowsinline

This setting existed in WebKit but Chromium never changed it from its default value. We're removing all such unchanging settings in Blink, along with their associated code.

This one isn't even referenced anymore except in the Settings.in file.

R=abarth@chromium.org
BUG=226711

Review URL: https://codereview.chromium.org/13999002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@148009 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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