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This reverts commit 3557d7dd.

Reason for revert: Caused failing on builder "linux-chromeos-chrome"
Bug: 1103100

Original change's description:
> Assistant: ensure single generic error message
> 
> Assistant processing v2 introduced a situation that allowed
> multiple error messages to flush to the screen due to
> AssistantInteractionControllerImpl::OnTtsStarted being
> called multiple times.
> 
> Add AssistantResponse::ContainsUiElement to check if duplicate
> error elements already exist before adding more.
> 
> Bug: b/158499400
> Change-Id: Ia90199ef8b733132fd5433ca47bb7905926b2f6e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2258196
> Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: David Black <dmblack@google.com>
> Cr-Commit-Position: refs/heads/master@{#785935}

TBR=xiaohuic@chromium.org,dmblack@google.com,updowndota@chromium.org,wutao@chromium.org,meilinw@chromium.org,jeroendh@chromium.org,cowmoo@chromium.org

Change-Id: I596b799de09518816642de2c86398849939f5d99
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/158499400
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2286531Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786160}