Revert "Propagate AlternateProtocolUsage enum from network service to browser"

This reverts commit edf429ba1a9b4c7db472a815ff5c49c41f720577.

Reason for revert: Many failures related to alternate_protocol_usage: https://ci.chromium.org/ui/p/chromium/builders/ci/Linux%20ChromiumOS%20MSan%20Tests/30706/overview

Example: 
Uninitialized value was stored to memory at
#0 0x560d7a2db8c9 in Serialize ./gen/services/network/public/mojom/alternate_protocol_usage.mojom-shared.h:95:13

Original change's description:
> Propagate AlternateProtocolUsage enum from network service to browser
> and blink service.
>
> In some cases, Chrome fails to use HTTP/3 even when the server
> supports HTTP/3, so it'll be useful to show the reason in the DevTools.
> The reason is to be expressed as AlternateProtocolUsage(enum), and
> the function to calculate it has already been implemented in network service.(https://crrev.com/c/3897695)
>
> However, currently it has only the enums to describe why an alternative job or a DNS HTTPS job is used, so we should make them richer.
> Especially we should prepare the enum to tell why HTTP/2 is used
> even when the server supports HTTP/3.
>
> But the purpose of this CL is not to enrich the enum but to implement the function needed to propagate the enum. Specifically, we have to propagate the enum from network service to browser service and blink service in order to show it in the DevTools. This CL is in charge of that.
>
> Design Docs is here:
> https://docs.google.com/document/d/1SfMy7MMTbSn2C1RkPxnlnQdj9AnZ5-fQdEl0XO1s2ZQ/edit?usp=sharing
>
> Bug: 1345536
> Change-Id: I776e422b3462a3eb8e5f94467b6caae08c8233e7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3890050
> Reviewed-by: Philip Rogers <pdr@chromium.org>
> Commit-Queue: Yoichiro Hibara <hibarayoichiro@google.com>
> Reviewed-by: Matthew Denton <mpdenton@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Reviewed-by: Clark DuVall <cduvall@chromium.org>
> Reviewed-by: Reilly Grant <reillyg@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1050104}

Bug: 1345536
Change-Id: I657ed355b94918852869b974c8ee56d363448396
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3913406
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Igor Ruvinov <igorruvinov@chromium.org>
Commit-Queue: Igor Ruvinov <igorruvinov@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1050192}