[PDF] Change SkPDFFormXObject to not hold a reference to device.

This prevents two copies of the content stream from sticking around.  It also fixes an invalid memory reference because SkCanvas::internalRestore deletes the device (maybe it should just unref) after drawing it onto the main device.

Review URL: http://codereview.appspot.com/4080056

git-svn-id: http://skia.googlecode.com/svn/trunk@773 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed