Fix iOS build

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
index fae5384..7d99c32 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -830,13 +830,6 @@
       # TODO(GYP) hook up asan on Mac. GYP has this extra dylib:
       #data += [ "$root_out_dir/libclang_rt.asan_osx_dynamic.dylib" ]
     }
-
-    if (is_ios) {
-      sources -= [
-        "files/file_path_watcher_fsevents.cc",
-        "files/file_path_watcher_fsevents.h",
-      ]
-    }
   } else {
     # Non-Mac.
     sources -= [