[tools][profiler] Fix JsonProfile script url

Use new Script.prototype.update method to set the url and the script
source.

Bug: v8:11850
Change-Id: I555d4d0158cdacb7cb42efa385371454542fc2f3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2944438Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74985}

tools/profile.mjs

@@ -48,8 +48,9 @@ export class SourcePosition {
 }
 
 export class Script {
-  name;
+  url;
   source;
+  name;
   // Map<line, Map<column, SourcePosition>>
   lineToColumn = new Map();
   _entries = [];
@@ -1222,7 +1223,9 @@ JsonProfile.prototype.addSourcePositions = function (
 };
 
 JsonProfile.prototype.addScriptSource = function (id, url, source) {
-  this.scripts_[id] = new Script(id, url, source);
+  const script = new Script(id);
+  script.update(url, source);
+  this.scripts_[id] = script;
 };
 
 JsonProfile.prototype.deoptCode = function (