* poppler/CairoOutputDev.cc:
        * poppler/CairoOutputDev.h: Change CairoOutputDev to render to a
        given surface and let the user create that surface.

        * glib/poppler-document.cc:
        * glib/poppler-page.cc:
        * glib/poppler-private.h: Create the cairo image surface here
        instead and pass it to the CairoOutputDev for rendering.

        * poppler/CairoOutputDevImage.cc:
        * poppler/CairoOutputDevImage.h:
        * poppler/CairoOutputDevX.cc:
        * poppler/CairoOutputDevX.h:
        * poppler/Makefile.am: Remove specialized cairo output devices.