Chrome 148 ships PerformanceResourceTiming.contentType (#29375)

Add Chrome support for ResourceTiming ContentType

Author: tunetheweb

api/PerformanceResourceTiming.json

@@ -265,7 +265,7 @@
           ],
           "support": {
             "chrome": {
-              "version_added": false
+              "version_added": "148"
             },
             "chrome_android": "mirror",
             "deno": {
@@ -291,7 +291,7 @@
             "webview_ios": "mirror"
           },
           "status": {
-            "experimental": true,
+            "experimental": false,
             "standard_track": true,
             "deprecated": false
           }