Renaming the chains() ranged iterator to chain() per suggestion by Richard Smith.

llvm-svn: 203262
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index f4fabc1..18a196c 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -686,7 +686,7 @@
   VisitValueDecl(D);
   Record.push_back(D->getChainingSize());
 
-  for (const auto *P : D->chains())
+  for (const auto *P : D->chain())
     Writer.AddDeclRef(P, Record);
   Code = serialization::DECL_INDIRECTFIELD;
 }