Stop using public_deps in system_wrappers.

TBR=phoglund@webrtc.org

Bug: webrtc:8603
Change-Id: I5e515f0e4dc955a01460d69ba4e21bdfdf152d20
Reviewed-on: https://webrtc-review.googlesource.com/29104
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Edward Lemur <ehmaldonado@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21112}
diff --git a/call/BUILD.gn b/call/BUILD.gn
index fbd1824..ac94457 100644
--- a/call/BUILD.gn
+++ b/call/BUILD.gn
@@ -101,6 +101,7 @@
     "../rtc_base:rtc_base_approved",
     "../rtc_base:sequenced_task_checker",
     "../system_wrappers",
+    "../system_wrappers:metrics_api",
   ]
   if (!build_with_chromium && is_clang) {
     # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
@@ -145,6 +146,7 @@
     "../rtc_base:rtc_task_queue",
     "../rtc_base:sequenced_task_checker",
     "../system_wrappers",
+    "../system_wrappers:metrics_api",
     "../video",
   ]
 }