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    Fix and refactor downloaded file handling in the loading stack · 47a9f9bc
    tzik authored
    In download_to_file mode of resource loading, the resource handler needs
    to call ResourceDispatcherHostImpl::RegisterDownloadedTempFile when the
    file is created, and needs to call UnregisterDownloadedTempFile after the
    client handles the file. Otherwise, the file is deleted before the client
    uses it.
    However, MojoAsyncResourceHandler doesn't call them, and that causes
    layout test failure around XHR with responseType = 'blob'. This CL fixes
    that by adding the RDTF and UDTF pair, and refactors similar code in
    AsyncResourceHandler to share the same lifetime management of the
    downloaded file in ResourceDispatcherHostImpl.
    
    BUG=603396, 659917
    
    Review-Url: https://codereview.chromium.org/2503813002
    Cr-Commit-Position: refs/heads/master@{#435551}
    47a9f9bc