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This reverts commit 0f98cc3e.

Reason for revert: Lots of assistant tests failing on this builder: https://ci.chromium.org/p/chrome/builders/ci/linux-chromeos-chrome

Example builds:
https://ci.chromium.org/ui/p/chrome/builders/ci/linux-chromeos-chrome/10457/overview
https://ci.chromium.org/ui/p/chrome/builders/ci/linux-chromeos-chrome/10451/overview
https://ci.chromium.org/ui/p/chrome/builders/ci/linux-chromeos-chrome/10456/overview

Original change's description:
> Uprev Libassistant to 1.50
>
> These are the public changes required to uprev to 1.50.
>
> NOTE: This includes the hash for the rolldep of src-internal,
> as Libassistant 1.50 made some non-backwards compatible API changes.
>
> The internal changes included can be found in crrev.com/i/3414233
>
> Bug: b/170170824
> Change-Id: I88f5836e896efe4005d6e9681175da36c07514b0
> Tests: Manually deployed and tested Assistant queries.
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2548684
> Commit-Queue: Jeroen Dhollander <jeroendh@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833190}

TBR=xiaohuic@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,jeroendh@chromium.org

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/170170824
Change-Id: I2f6ad96933dabb7a9b100dfe45ac28a62979ce67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572117Reviewed-by: Jeroen Dhollander <jeroendh@chromium.org>
Commit-Queue: Jeroen Dhollander <jeroendh@chromium.org>
Auto-Submit: Jeroen Dhollander <jeroendh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833356}