Update references to v8/snapshot_toolchain.gni

R=machenbach@chromium.org, scottmg@chromium.org

Bug: v8:9253
Change-Id: Ie4bf8766a53a09c28ad63d1f74fbecfb5e0888e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1611935Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660316}

BUILD.gn

@@ -25,8 +25,8 @@ import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
 import("//ui/base/ui_features.gni")
 import("//ui/ozone/ozone.gni")
 import("//ui/webui/webui_features.gni")
+import("//v8/gni/snapshot_toolchain.gni")
 import("//v8/gni/v8.gni")
-import("//v8/snapshot_toolchain.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")

chrome/test/base/js2gtest.gni

@@ -2,8 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//v8/gni/snapshot_toolchain.gni")
 import("//v8/gni/v8.gni")
-import("//v8/snapshot_toolchain.gni")
 
 # Variables:
 #   test_type: One of 'webui', 'unit' or 'extension' indicating what

tools/v8_context_snapshot/BUILD.gn

@@ -11,7 +11,7 @@ import("//tools/v8_context_snapshot/v8_context_snapshot.gni")
 
 import("//build/config/c++/c++.gni")
 import("//build/config/compiler/compiler.gni")
-import("//v8/snapshot_toolchain.gni")
+import("//v8/gni/snapshot_toolchain.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")