Land chromium-side work to clean up handling of v8_target_cpu in the GN build.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
 import("//build/config/compiler/compiler.gni")
 import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
 import("//media/media_options.gni")
 import("//third_party/openh264/openh264_args.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
+import("//v8/snapshot_toolchain.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 declare_args() {
   # A list of extra dependencies to add to the root target. This allows a
   # checkout to add additional targets without explicitly changing any checked-
   # in files.
   root_extra_deps = []
@@ skipping 940 matching lines @@
         "//net:hpack_fuzz_wrapper",
         "//skia:filter_fuzz_stub",
       ]
     }
     if (enable_ipc_fuzzer && !is_component_build) {
       deps += [ "//tools/ipc_fuzzer:ipc_fuzzer_all" ]
     }
     if (!is_chromeos) {
       deps += [
         "//third_party/pdfium/samples:pdfium_test",
-        "//v8:v8_shell($host_toolchain)",
+        "//v8:v8_shell($v8_snapshot_toolchain)",
       ]
     }
     if (is_clang) {
       deps += [ "//build/sanitizers:copy_llvm_symbolizer" ]
     }
     if (is_win && symbol_level == 2 && target_cpu == "x86" && is_syzyasan) {
       deps += [
         "//chrome/tools/build/win/syzygy:chrome_dll_syzygy",
         "//content/shell:content_shell_syzyasan",
       ]
@@ skipping 46 matching lines @@
   assert(target_name != "")  # Mark as used.
   sources = invoker.actual_sources
   assert(
       sources == invoker.actual_sources,
       "Do not use a platform name in your output directory (found \"$root_build_dir\"). http://crbug.com/548283")
 }
 
 assert_valid_out_dir("_unused") {
   actual_sources = [ "$root_build_dir/foo" ]
 }