Implement the webview independantly from the Browser
Summary
We want to have up-to-date webview as soon as possible
Description
What is the current behavior?
We update Browser and Webview at the same time.
As the patches are sometime tricky to implement, we don't update fast enough and are late.
Users complain they don't receive Chromium/Bromite update fast enough, and it can be a problem for security
What is the improved behavior?
The idea would be to build webview from Bromite directly, and use our fork only for the Browser.
What does it bring?
Webview easier to update