[GN] Set v8_use_external_snapshot_data for the same configurations as GN.

BUG=421063

Review URL: https://codereview.chromium.org/796903002

Cr-Original-Commit-Position: refs/heads/master@{#308779}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: def2eb00493259ff297e8792fee35dc7dc2204b5

module_args/v8.gni

@@ -6,7 +6,5 @@ if (is_android) {
   import("//build/config/android/config.gni")
 }
 
-# TODO(baixo) enable this once this lands:
-# https://codereview.chromium.org/749213004
-# v8_use_external_startup_data = is_android && !is_android_webview_build
-v8_use_external_startup_data = false
+v8_use_external_startup_data =
+    !((is_android && is_android_webview_build) || is_chromeos || is_win)