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This is a reland of 29dca9fe

Remove an unnecessary include to fix the compile break:

  ../../chromeos/services/assistant/assistant_manager_service_impl.cc:27:10: fatal error: 'chromeos/services/assistant/assistant_warmer_welcome_log.pb.h' file not found
  #include "chromeos/services/assistant/assistant_warmer_welcome_log.pb.h"
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  1 error generated.

Bug: None.
Test: Compiled

Original change's description:
> Enable warmer welcome during Assistant launch.
>
> 1. It is guarded by a finch flag AssistantWarmerWelcome.
> 2. WW only shows 3 times.
>
> Bug: b:112495005
> Test: Manual
>
> Change-Id: I80cbcfd4104c17172939d36b986be65077bf0bb3
> Reviewed-on: https://chromium-review.googlesource.com/c/1355174
> Reviewed-by: Will Harris <wfh@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Commit-Queue: Yilei Li <yileili@google.com>
> Cr-Commit-Position: refs/heads/master@{#614553}

Bug: b:112495005
Change-Id: I9c67fd0c85b216e17408056c6d7df35e6f205c6f
Reviewed-on: https://chromium-review.googlesource.com/c/1367185Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yilei Li <yileili@google.com>
Cr-Commit-Position: refs/heads/master@{#614756}