Closes issue #7983: Generate a file name when the content provider doesn't provide one.

[Amejia481]

When we get an uri from a file provider, we were trusting the provider to always provide a valid file name (DISPLAY_NAME) that is not always true, as we can see crashes on #7983, now when we can't find the file name, we are trying to generate a file name as it's required for the file to be updated.

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[Amejia481]

bors r=pocmo

[bors]

Build succeeded:

• complete-push