Revert of Add support for single sample metrics.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index efeb21abff80f2a2b1ba8fddd2bb045f9bc7583c..3cd25f1ebba73068fdcfec0e57e0bcb32d4fc927 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -51,8 +51,6 @@
 #include "cc/trees/layer_tree_host_common.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "components/discardable_memory/client/client_discardable_shared_memory_manager.h"
-#include "components/metrics/public/interfaces/single_sample_metrics.mojom.h"
-#include "components/metrics/single_sample_metrics.h"
 #include "content/child/appcache/appcache_dispatcher.h"
 #include "content/child/appcache/appcache_frontend_impl.h"
 #include "content/child/blob_storage/blob_message_filter.h"
@@ -395,23 +393,6 @@
   return cmdline->HasSwitch(switches::kIsRunningInMash);
 }
 
-// Hook that allows single-sample metric code from //components/metrics to
-// connect from the renderer process to the browser process.
-void CreateSingleSampleMetricsProvider(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-    service_manager::Connector* connector,
-    metrics::mojom::SingleSampleMetricsProviderRequest request) {
-  if (task_runner->BelongsToCurrentThread()) {
-    connector->BindInterface(mojom::kBrowserServiceName, std::move(request));
-    return;
-  }
-
-  task_runner->PostTask(
-      FROM_HERE,
-      base::Bind(&CreateSingleSampleMetricsProvider, std::move(task_runner),
-                 connector, base::Passed(&request)));
-}
-
 }  // namespace
 
 // For measuring memory usage after each task. Behind a command line flag.
@@ -632,10 +613,6 @@
 
   // Register this object as the main thread.
   ChildProcess::current()->set_main_thread(this);
-
-  metrics::InitializeSingleSampleMetricsFactory(
-      base::BindRepeating(&CreateSingleSampleMetricsProvider,
-                          message_loop()->task_runner(), GetConnector()));
 
   gpu_ = ui::Gpu::Create(
       GetConnector(),