Keep multipart responses in m_nonBlockingLoaders after first part loaded

For multipart responses, in the first ResourceLoader::didFinishLoadingOnePart(),
(1) the ResourceLoader is moved from |m_loaders| to |m_nonBlockingLoaders|
    in ResourceFetcher::subresourceLoaderFinishedLoadingOnePart(), and
(2) it is removed from |m_nonBlockingLoaders| in
    ResourceFetcher::willTerminateResourceLoader() called in didFinishLoading().
Therefore, if we call window.stop() just after multipart <img>'s onload event,
we cannot stop loading of the multipart response because it is no longer in
|m_loaders| nor |m_nonBlockingLoaders|.

However, in the second didFinishLoadingOnePart(),
(3) In subresourceLoaderFinishedLoadingOnePart(),
    the ResourceLoader is added again to |m_nonBlockingLoaders|, and
(4) We don't call didFinishLoading()/willTerminateResourceLoader().
Therefore, we can stop loading of the image after that by window.stop().

This CL makes the ResourceLoader to be kept in |m_nonBlockingLoaders| after (1)
and to be remove from |m_nonBlockingLoaders| when
ResourceLoader::didFinishLoading() is called.
This CL enables to stop loading of multipart responses at any time, and also
enables https://codereview.chromium.org/1756953002/ to stop dispatching
didFinishLoadingOnePart() for each part without affecting window.stop()
behavior on multipart responses.

BUG=570608

Review URL: https://codereview.chromium.org/1800333003

Cr-Commit-Position: refs/heads/master@{#381876}

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