Add metrics_metadata target to chrome_official_builder_no_unittests.

BUG=699328

Review-Url: https://codereview.chromium.org/2802093007
Cr-Commit-Position: refs/heads/master@{#463386}

BUILD.gn

@@ -746,6 +746,7 @@ if (is_win) {
       "//courgette",
       "//courgette:copy_courgette_binaries",
       "//remoting/webapp",
+      "//tools/metrics:metrics_metadata",
     ]
 
     if (target_cpu == "x86") {