Remove custom handling for file types

[yanokwa]

From #3163

"For a rainy day / good first issue, some of the types that Collect matches against are handled by the Android type mapper. It would be great for someone to go through and remove custom handling for those, I think."

[seadowg]

This is in reference to CollectThenSystemContentTypeMapper which has quite a lot of hardcoded extension to content type mappings that it could probably be deferring to Android.

[lognaturel]

Specifically, https://github.com/opendatakit/collect/blob/master/collect_app/src/main/java/org/odk/collect/android/http/CollectThenSystemContentTypeMapper.java#L34 has the custom map. The source for Android's MimeTypeMap is here. All of the mappings that match can be removed from the custom map.

[seadowg]

I was worried that Android's version might not be the same for all the versions we support but it looks like from the log (https://android.googlesource.com/platform/frameworks/base/+log/61ae88e/core/java/android/webkit/MimeTypeMap.java) that it hasn't been touched for about 9 years.

It's probably worth checking once we've done this that "video/3gpp" still works on an API 16 device to make sure that the last changes made it in to Jelly Bean.

[chidauri]

Hi, i want to work on this issue(it really is rainy day here :P)

[seadowg]

@chidauri go for it! If you want to claim an issue have a look at this guide

[chidauri]

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