Make single_sample_metrics into its own target

content/browser/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 32 matching lines @@
     "//cc/animation",
     "//cc/paint",
     "//cc/surfaces",
     "//components/discardable_memory/common",
     "//components/discardable_memory/service",
     "//components/display_compositor",
     "//components/filesystem:lib",
     "//components/leveldb:lib",
     "//components/link_header_util",
     "//components/metrics",
+    "//components/metrics:single_sample_metrics",
     "//components/mime_util",
     "//components/payments/mojom:mojom_payment_app",
     "//components/rappor",
     "//components/tracing",
     "//components/tracing:startup_tracing",
     "//components/url_formatter",
     "//components/variations",
     "//components/viz/frame_sinks",
     "//content:resources",
     "//content/app/resources",
@@ skipping 2065 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }