feat(chromium): roll chromium to r624492 (#3909)

This roll includes:
- https://crrev.com/624492 - Disable sending KeyUpdates by default.

Fixes #3893, #3880

package.json

@@ -8,7 +8,7 @@
     "node": ">=6.4.0"
   },
   "puppeteer": {
-    "chromium_revision": "624487"
+    "chromium_revision": "624492"
   },
   "scripts": {
     "unit": "node test/test.js",