Remove dead declaration.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@352257 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/ELF/InputFiles.h b/ELF/InputFiles.h
index d849edd..c8a79be 100644
--- a/ELF/InputFiles.h
+++ b/ELF/InputFiles.h
@@ -184,7 +184,6 @@
 
   StringRef getShtGroupSignature(ArrayRef<Elf_Shdr> Sections,
                                  const Elf_Shdr &Sec);
-  ArrayRef<Elf_Word> getShtGroupEntries(const Elf_Shdr &Sec);
 
 public:
   static bool classof(const InputFile *F) { return F->kind() == Base::ObjKind; }