Pull boringssl generated source from boringssl_gen

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() {
-  dart_io_support = false
-
-  # TODO(zra, jamesr): Remove this check once we start building boringssl for
-  # the fuchsia port.
-  if (!defined(is_fuchsia) || !is_fuchsia) {
-    dart_boringssl_path = "../../third_party/boringssl"
-  }
-}
-
-
 resources_sources_gypi =
     exec_script("../../tools/gypi_to_gn.py",
                 [rebase_path("vmservice/vmservice_sources.gypi")],
                 "scope",
                 ["vmservice/vmservice_sources.gypi"])
 
 # Generate a resources.cc file for the service isolate without Observatory.
 action("gen_resources_cc") {
   visibility = [ ":*" ] # Only targets in this file can see this.
   script = "../tools/create_resources.py"
@@ skipping 312 matching lines @@
   if (is_mac || is_ios) {
     libs = [
       "Security.framework",
     ]
   } else if (defined(is_fuchsia) && is_fuchsia) {
     defines = [
       "DART_IO_SECURE_SOCKET_DISABLED"
     ]
   } else {
     deps = [
-      rebase_path(dart_boringssl_path, "."),
+      "//third_party/boringssl",
     ]
   }
 
   sources = io_impl_sources_gypi.sources + builtin_impl_sources_gypi.sources
   sources += [
     "builtin_nolib.cc",
     "builtin_natives.cc",
     "io_natives.cc",
     "io_natives.h",
     "embedded_dart_io.cc",
@@ skipping 206 matching lines @@
     sources = [
       "run_vm_tests_fuchsia.cc"
     ]
     libs = [
       "launchpad",
       "magenta",
       "runtime",
     ]
   }
 }  # defined(is_fuchsia) && is_fuchsia