Revert of Add support for single sample metrics.

components/metrics/BUILD.gn

Index: components/metrics/BUILD.gn
diff --git a/components/metrics/BUILD.gn b/components/metrics/BUILD.gn
index f2456a1b50c903cd973ba6d0fba67f81f64b4960..cde2219d52612c4f4183cd9c86e30193361c762e 100644
--- a/components/metrics/BUILD.gn
+++ b/components/metrics/BUILD.gn
@@ -91,11 +91,8 @@
   ]
 
   public_deps = [
-    ":single_sample_metrics",
     "//components/metrics/proto",
-    "//components/metrics/public/interfaces:single_sample_metrics_mojo_bindings",
-  ]
-
+  ]
   deps = [
     ":call_stack_profile_params",
     "//base",
@@ -249,22 +246,6 @@
       "//base",
     ]
   }
-}
-
-source_set("single_sample_metrics") {
-  sources = [
-    "single_sample_metrics.cc",
-    "single_sample_metrics.h",
-    "single_sample_metrics_factory_impl.cc",
-    "single_sample_metrics_factory_impl.h",
-  ]
-
-  deps = [
-    "//components/metrics/public/interfaces:single_sample_metrics_mojo_bindings",
-    "//mojo/public/cpp/bindings",
-    "//services/service_manager/public/cpp",
-    "//services/service_manager/public/interfaces",
-  ]
 }
 
 source_set("call_stack_profile_params") {
@@ -354,7 +335,6 @@
     "persisted_logs_unittest.cc",
     "profiler/profiler_metrics_provider_unittest.cc",
     "profiler/tracking_synchronizer_unittest.cc",
-    "single_sample_metrics_factory_impl_unittest.cc",
     "stability_metrics_helper_unittest.cc",
     "stability_metrics_provider_unittest.cc",
     "ui/screen_info_metrics_provider_unittest.cc",