feat(chromium): roll Chromium to r604907 (#3488)

Also, new Chrome now exposes a new type in its protocol - binary.
It becomes a raw C++ array once used through C++ bindings, but for
us it's still a base64 string.

package.json

@@ -8,7 +8,7 @@
     "node": ">=6.4.0"
   },
   "puppeteer": {
-    "chromium_revision": "599821"
+    "chromium_revision": "604907"
   },
   "scripts": {
     "unit": "node test/test.js",

utils/protocol-types-generator/index.js

@@ -13,6 +13,7 @@ module.exports = puppeteer.launch({
   const version = await browser.version();
   await browser.close();
   const output = `// This is generated from /utils/protocol-types-generator/index.js
+  type binary = string;
 declare global {
   module Protocol {${json.domains.map(domain => `${domain.description ? `
     /**
@@ -101,4 +102,4 @@ function typeOfProperty(property, domain) {
       return 'number';
   }
   return property.type;
-}
+}