Add missing include

This file is only compiled when the GN arg
|enable_fake_assistant_microphone=true| is used,
which is why it was broken without people realizing.

Bug: N/A
Test: N/A
Change-Id: Ibeae35d306506710d2d7a3a9687a2d16db3a7a79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260940
Commit-Queue: Jeroen Dhollander <jeroendh@google.com>
Commit-Queue: Tao Wu <wutao@chromium.org>
Auto-Submit: Jeroen Dhollander <jeroendh@google.com>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781470}

chromeos/services/assistant/platform/fake_input_device.cc

@@ -13,6 +13,7 @@
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/location.h"
+#include "base/logging.h"
 #include "base/task/task_traits.h"
 #include "base/task/thread_pool.h"
 #include "base/time/time.h"