revert BUILD.gn

Author: anonymouspc

llvm/utils/gn/secondary/libcxx/include/BUILD.gn

@@ -1352,7 +1352,6 @@ if (current_toolchain == default_toolchain) {
       "__ranges/all.h",
       "__ranges/as_rvalue_view.h",
       "__ranges/chunk_by_view.h",
-      "__ranges/chunk_view.h",
       "__ranges/common_view.h",
       "__ranges/concepts.h",
       "__ranges/container_compatible_range.h",