CoreServices is not available on iOS. Don't add it as a dependency.

runtime/bin/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 declare_args() {
   # Whether to fall back to built-in root certificates when they cannot be
   # verified at the operating system level.
   dart_use_fallback_root_certificates = false
 
   # The BUILD.gn file that we pull from chromium as part of zlib has a
@@ skipping 356 matching lines @@
       "*_macos.h",
       "*_macos.cc",
     ]
   }
   set_sources_assignment_filter(custom_sources_filter)
 
   defines = []
   if (is_mac || is_ios) {
     libs = [
       "CoreFoundation.framework",
-      "CoreServices.framework",
       "Security.framework",
     ]
+
+    if (is_mac) {
+      libs += [
+        "CoreServices.framework",
+      ]
+    }
   } else if (defined(is_fuchsia) && is_fuchsia) {
     defines += [
       "DART_IO_SECURE_SOCKET_DISABLED"
     ]
   } else {
     deps = [
       "//third_party/boringssl",
     ]
   }
 
@@ skipping 346 matching lines @@
     ]
     include_dirs = [
       "..",
     ]
     defines = [
       # The only effect of DART_SHARED_LIB is to export the Dart API.
       "DART_SHARED_LIB",
     ]
   }
 }