[debugger] simplify fetching scripts for inspector.

test/inspector/debugger/script-on-after-compile.js

Index: test/inspector/debugger/script-on-after-compile.js
diff --git a/test/inspector/debugger/script-on-after-compile.js b/test/inspector/debugger/script-on-after-compile.js
index 9281ace12a065642ac2667536f96e5c175556d1c..083aa48065e6ca12f71e1c1ee11579761dfed648 100644
--- a/test/inspector/debugger/script-on-after-compile.js
+++ b/test/inspector/debugger/script-on-after-compile.js
@@ -1,7 +1,6 @@
 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-// Flags: --expose_gc
 
 print("Checks that inspector correctly process compiled scripts");
 
@@ -49,9 +48,10 @@ addScripts()
   .then(() => Protocol.Debugger.enable())
   .then(addScripts)
   .then(() => Protocol.Debugger.disable())
-
-  .then(() => InspectorTest.log("Run gc and then Debugger.enable().."))
-  .then(() => Protocol.Runtime.evaluate({ expression: "for (let i = 1; i < 20; ++i) eval(`foo${i} = undefined`); gc();" }))
+  .then(() => InspectorTest.log("Remove script references and re-enable debugger."))
+  .then(() => Protocol.Runtime.evaluate(
+      { expression: "for (let i = 1; i < 20; ++i) eval(`foo${i} = undefined`);" }))
+  .then(() => Protocol.HeapProfiler.collectGarbage())
   .then(() => Protocol.Debugger.enable())
   .then(InspectorTest.completeTest);