...with the same rationale as recent 543158ed
"Require XComponentContext.getServiceManager to throw instead of returning null"
(this helps find problems like 065a758d0c2b66c6683d648347b7a6cdef4a80f7 "Enable
experimental gtk3 plugin only via SAL_USE_VCLPLUGIN").

Removed comphelper::createProcessComponent[WithAguments] and replaced its few
uses with direct calls to createInstance[WithArguments].

Change-Id: Ia44b8656f74de88ef6eab3eb6bd597729b08e1c8