What's going on with Chromium size, it has grown three times in the latest minor release (1.17.0 -> 1.18.0)

I'm trying to install `puppeteer` on Linux and was shocked by the Chromium size:

```sh

npm i puppeteer@1.17.0

Downloading Chromium r662092 - **111.6 Mb**
```

```sh

npm i puppeteer@1.18.0

Downloading Chromium r669486 - **347.1 Mb**
```

Is Chromium growing so rapidly or is it a bug?