[gn build] Port cdd3e96

Author: llvmgnsyncbot

llvm/utils/gn/secondary/lldb/source/Plugins/SymbolFile/DWARF/BUILD.gn

@@ -50,7 +50,6 @@ static_library("DWARF") {
     "DWARFContext.cpp",
     "DWARFDIE.cpp",
     "DWARFDataExtractor.cpp",
-    "DWARFDebugAbbrev.cpp",
     "DWARFDebugArangeSet.cpp",
     "DWARFDebugAranges.cpp",
     "DWARFDebugInfo.cpp",