feat(chromium): roll Chromium to r649004 (#4259)

This roll includes:
- https://crrev.com/648988 - perfetto: Emit trace config in TraceEventMetadataSource

lib/Launcher.js

@@ -49,8 +49,6 @@ const DEFAULT_ARGS = [
   '--disable-features=site-per-process,TranslateUI,BlinkGenPropertyTrees',
   '--disable-hang-monitor',
   '--disable-ipc-flooding-protection',
-  // TODO: Perfetto is disabled due to crbug.com/950620
-  '--disable-perfetto',
   '--disable-popup-blocking',
   '--disable-prompt-on-repost',
   '--disable-renderer-backgrounding',