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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}