[DevTools] Remove Object.values and Object.isEmpty from utilities.js
- replaced some object-based maps with real Map;
- remove Object.values and Object.isEmpty from utilities.js;
- better typing;
Object.values method will be added in ES2017. Closure compiler already supports it via externs, to roll it we need to remove it. It was mostly used for Objects that were used for maps, it's better to have real maps instead.
R=dgozman@chromium.org,lushnikov@chromium.org
Review-Url: https://codereview.chromium.org/2163093003
Cr-Commit-Position: refs/heads/master@{#406634}
15 files changed
