GN: Fix references to $root_build_dir/natives_blob.bin -> $root_out_dir

gin/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build_overrides/v8.gni")
 import("//testing/test.gni")
 
 component("gin") {
   sources = [
     "arguments.cc",
@@ skipping 79 matching lines @@
     defines += [ "V8_VERIFY_EXTERNAL_STARTUP_DATA" ]
   }
 
   configs += [ "//v8:external_startup_data" ]
 }
 
 if (v8_use_external_startup_data) {
   action("gin_v8_snapshot_fingerprint") {
     script = "//gin/fingerprint/fingerprint_v8_snapshot.py"
 
-    snapshot_file = "$root_build_dir/snapshot_blob.bin"
-    natives_file = "$root_build_dir/natives_blob.bin"
+    snapshot_file = "$root_out_dir/snapshot_blob.bin"
+    natives_file = "$root_out_dir/natives_blob.bin"
     output_file = "$target_gen_dir/v8_snapshot_fingerprint.cc"
 
     args = [
       "--snapshot_file",
       rebase_path(snapshot_file, root_build_dir),
       "--natives_file",
       rebase_path(natives_file, root_build_dir),
       "--output_file",
       rebase_path(output_file, root_build_dir),
     ]
@@ skipping 63 matching lines @@
     "v8_isolate_memory_dump_provider_unittest.cc",
     "wrappable_unittest.cc",
   ]
 
   deps = [
     ":gin_test",
     "//base/test:test_support",
     "//v8",
   ]
 }