Fix races when the same bits are downloaded from 2 URLs.
Until now, we were saving downloaded file to the temporary directory with a name being the hash of the file content. It means there is a race when the same content is downloaded from 2 different URLs. To fix this, we now create an intermediary directory that is the hash of the URL. Also, because this is only needed for debugging with gdb, and this is inefficient in term of both CPU and storage (we do not know when to delete the temporary directory), we control this with a command line flag. R=ncbray@chromium.org, eseidel@chromium.org BUG=https://github.com/domokit/mojo/issues/61 Review URL: https://codereview.chromium.org/1011333003
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