Remove dependency on Fuchsia's runtime library.

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 625 matching lines @@
 
   executable("run_vm_tests_fuchsia") {
     testonly = true
     configs += ["..:dart_config"]
     sources = [
       "run_vm_tests_fuchsia.cc"
     ]
     libs = [
       "launchpad",
       "magenta",
-      "runtime",
     ]
   }
 }
 
 # This is only needed for the Fuchsia target build until the Observatory is
 # supported.
 dart_executable("dart_no_observatory") {
   extra_deps = [
     "..:libdart",
     ":dart_snapshot_cc",
@@ skipping 153 matching lines @@
       libs = [
         "dart.lib"
       ]
       abs_root_out_dir = rebase_path(root_out_dir)
       ldflags = [
         "/LIBPATH:$abs_root_out_dir"
       ]
     }
   }
 }