[w3c/manifest] Steps to install the web application does not take into account whether the installation process was canceled (#787)

The spec defines [**installation was canceled**](https://www.w3.org/TR/appmanifest/#dfn-installation-was-canceled) but this term is never referenced anywhere.

The [**steps to install the web application**](https://www.w3.org/TR/appmanifest/#dfn-steps-to-install-the-web-application) trigger the installation process but then proceeds without explicitly checking whether the install was cancelled.

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Received on Thursday, 12 September 2019 01:48:21 UTC