smart_dim: Remove unneeded include and expose metrics.h.

Fixes `gn check` errors.
Split out from crrev.com/c/2383400

Bug: 898837
Change-Id: Ia8e32e907bddc56c6e214d5c2ab1f5477fe1a2f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384709
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803525}

chrome/browser/chromeos/power/ml/smart_dim/BUILD.gn

@@ -4,6 +4,7 @@
 
 source_set("smart_dim") {
   public = [
+    "metrics.h",
     "ml_agent.h",
     "model.h",
     "model_impl.h",
@@ -15,7 +16,6 @@ source_set("smart_dim") {
     "download_worker.cc",
     "download_worker.h",
     "metrics.cc",
-    "metrics.h",
     "ml_agent.cc",
     "ml_agent.h",
     "ml_agent_util.cc",

chrome/browser/component_updater/smart_dim_component_installer.cc

@@ -18,7 +18,6 @@
 #include "base/task/post_task.h"
 #include "base/task/thread_pool.h"
 #include "base/version.h"
-#include "chrome/browser/chromeos/power/ml/smart_dim/download_worker.h"
 #include "chrome/browser/chromeos/power/ml/smart_dim/metrics.h"
 #include "chrome/browser/chromeos/power/ml/smart_dim/ml_agent.h"
 #include "chromeos/constants/chromeos_features.h"