Re: [w3c/manifest] Support a way to update explicitly (#446)

Changing the manifest URL shouldn't be required (and it may even interfere with the process).

Assuming you have the app installed via the improved add to home screen (i.e. it appears in the Android app list), when you launch the app Chrome will fetch the manifest, parse it, and compare its data to the data we have baked into the app. If things differ, an update is requested and will go through when possible. Hence this being entirely user-transparent, it should just happen in the background.

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