This was introduced in bug 726817 for B2G stuff and there is no call site of
SetClampScrollPosition now and the only one entry point to call the function
was nsIFrameLoader.clampScrollPosition which was removed in
https://hg.mozilla.org/mozilla-central/rev/cd9aace7bb96 .
ScrollFrameHelper::ShouldClampScrollPosition() had always returned true in both
cases of root and non-root scrollable frames. (In the case of non-root
scrollable, nsFrameLoader.mClampScrollPosition is initially set to true and
nobody changes the value)
Differential Revision: https://phabricator.services.mozilla.com/D22026
--HG--
extra : moz-landing-system : lando
af78a85968