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This fixes the flaky crash in screen_orientation/page-visibility.html

The willBeDestroyed callback of GeolocationController has not been called in either build since r175404.

In addition LocalFrame supplements receive an explicit callback when the LocalHost is torn down in order to perform coordinated cleanup. This callback can be removed again once LocalFrame is moved to the heap and it again dies together with its supplements.

R=ager@chromium.org, tkent@chromium.org
BUG=

Review URL: https://codereview.chromium.org/335573004

git-svn-id: svn://svn.chromium.org/blink/trunk@176102 bbb929c8-8fbe-4397-9dbb-9b2b20218538