Remove the duplicated << overloaded operator from RemoteLayerTreeTransaction for printing out
a given FloatSize object. The RemoteLayerTreeTransaction inherits from TextStream, which already
provides that overloaded operator. Format of the output is a bit different so hopefully nothing
breaks further.

* Shared/mac/RemoteLayerTreeTransaction.mm:
(WebKit::RemoteLayerTreeTextStream::operator<<):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158185 268f45cc-cd09-0410-ab3c-d52691b4dbfc