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This is a reland of bba21f27
Original change's description:
> Always send subresource ULF on navigation
> 
> This changes the Network Service-enabled browser-side navigation path
> to always send a default subresource URLLoaderFactory to the render
> frame on navigation commit.
> 
> In addition to sending a default ULF, we also send one for blobs.
> Ultimately the idea here is to have the browser, at navigation time,
> send a frame everything it will need to request any accessible
> subresources, making it easier to reason about what subresource
> capabilities any given frame has.
> 
> This set of capabilities is encapsulated by a new
> URLLoaderFactoryBundle type, which can be serialized over mojom and is
> now passed in new-document navigation commit messages.
> 
> Follow-up usage of URLLoaderFactoryBundle will support loading things
> like file:// and chrome-extension:// subresources when appropriate.
> 
> Note that this does not yet change how workers acquire ULFs for their
> own resource requests.
> 
> Bug: 721414,759230
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
> Change-Id: I47b0897c7c012292633d5f08c874a18cc0fb1dcb
> Reviewed-on: https://chromium-review.googlesource.com/740904
> Commit-Queue: Ken Rockot <rockot@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#512459}

Bug: 721414, 759230
Change-Id: Ie13bcd97b7a5af8dbe4263a70239ba124205da15
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation

TBR=dcheng@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Ie13bcd97b7a5af8dbe4263a70239ba124205da15
Reviewed-on: https://chromium-review.googlesource.com/744222
Commit-Queue: Ken Rockot <rockot@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512706}