DevTools: switch Timeline frontend into buffered mode and remove the corresponding experiment.

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index a548f63d462d76661a9095bc4683baec583a9655..8b70e3c214700e0e5fbc26beeea92360aca81a42 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -2888,7 +2888,6 @@
                 "name": "start",
                 "parameters": [
                     { "name": "maxCallStackDepth", "optional": true, "type": "integer", "description": "Samples JavaScript stack traces up to <code>maxCallStackDepth</code>, defaults to 5." },
-                    { "name": "bufferEvents", "optional": true, "type": "boolean", "hidden": true, "description": "Whether instrumentation events should be buffered and returned upon <code>stop</code> call." },
                     { "name": "liveEvents", "optional": true, "type": "string", "hidden": true, "description": "Coma separated event types to issue although bufferEvents is set."},
                     { "name": "includeCounters", "optional": true, "type": "boolean", "hidden": true, "description": "Whether counters data should be included into timeline events." },
                     { "name": "includeGPUEvents", "optional": true, "type": "boolean", "hidden": true, "description": "Whether events from GPU process should be collected." }
@@ -2929,7 +2928,8 @@
             {
                 "name": "stopped",
                 "parameters": [
-                    { "name": "consoleTimeline", "type": "boolean", "optional": true, "description": "If specified, identifies that timeline was started using console.timeline() call." }
+                    { "name": "consoleTimeline", "type": "boolean", "optional": true, "description": "If specified, identifies that timeline was started using console.timeline() call." },
+                    { "name": "events", "type": "array", "items": { "$ref": "TimelineEvent" }, "optional": true, "hidden": true, "description": "Timeline event record data." }
                 ],
                 "description": "Fired when timeline is stopped.",
                 "hidden": true