[ES6 modules] Enable moduleScripts under experimental-web-platform-features

BUG=594639

Review-Url: https://codereview.chromium.org/2848193002
Cr-Commit-Position: refs/heads/master@{#468401}
diff --git a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5 b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
index 318f289..f013d3b 100644
--- a/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
+++ b/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
@@ -630,7 +630,7 @@
     },
     {
       name: "ModuleScripts",
-      status: "test",
+      status: "experimental",
     },
     {
       name: "MojoJS",