Revert of Create and integrate a metrics service client into Blimp engine.

blimp/engine/common/blimp_browser_context.cc

Index: blimp/engine/common/blimp_browser_context.cc
diff --git a/blimp/engine/common/blimp_browser_context.cc b/blimp/engine/common/blimp_browser_context.cc
index b5c8294a16a55534d133bf37358f9fa35fc53256..6a2a7ec04ad9ba83d257b766bf9ef850515804b0 100644
--- a/blimp/engine/common/blimp_browser_context.cc
+++ b/blimp/engine/common/blimp_browser_context.cc
@@ -7,26 +7,13 @@
 #include "base/bind.h"
 #include "base/environment.h"
 #include "base/files/file_util.h"
-#include "base/memory/ptr_util.h"
 #include "base/nix/xdg_util.h"
 #include "base/path_service.h"
 #include "blimp/engine/app/blimp_permission_manager.h"
-#include "components/metrics/metrics_service.h"
-#include "components/pref_registry/pref_registry_syncable.h"
-#include "components/prefs/in_memory_pref_store.h"
-#include "components/prefs/pref_service.h"
-#include "components/prefs/pref_service_factory.h"
 #include "content/public/browser/background_sync_controller.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/storage_partition.h"
 #include "content/public/common/content_switches.h"
-
-namespace {
-// Function for optionally handling read errors. Is a no-op for Blimp.
-// While the PersistentPrefStore's interface is supported, it is an in-memory
-// store only.
-void IgnoreReadError(PersistentPrefStore::PrefReadError error) {}
-}  // namespace
 
 namespace blimp {
 namespace engine {
@@ -72,11 +59,9 @@
       off_the_record_(off_the_record),
       net_log_(net_log) {
   InitWhileIOAllowed();
-  InitializeBlimpMetrics(GetPrefService(), GetSystemRequestContextGetter());
 }
 
 BlimpBrowserContext::~BlimpBrowserContext() {
-  FinalizeBlimpMetrics();
   if (resource_context_) {
     content::BrowserThread::DeleteSoon(content::BrowserThread::IO, FROM_HERE,
                                        resource_context_.release());
@@ -92,22 +77,6 @@
   if (!base::PathExists(path_))
     base::CreateDirectory(path_);
   BrowserContext::Initialize(this, path_);
-}
-
-std::unique_ptr<PrefService> BlimpBrowserContext::GetPrefService() {
-  // Create PrefRegistry and register metrics services preferences with it.
-  scoped_refptr<user_prefs::PrefRegistrySyncable> pref_registry(
-      new user_prefs::PrefRegistrySyncable());
-  metrics::MetricsService::RegisterPrefs(pref_registry.get());
-  PrefServiceFactory pref_service_factory;
-
-  // Create an in memory preferences store to hold metrics logs.
-  pref_service_factory.set_user_prefs(new InMemoryPrefStore());
-  pref_service_factory.set_read_error_callback(base::Bind(&IgnoreReadError));
-
-  // Create a PrefService binding the PrefRegistry to the InMemoryPrefStore.
-  // The PrefService ends up owning the PrefRegistry and the InMemoryPrefStore.
-  return pref_service_factory.Create(pref_registry.get());
 }
 
 std::unique_ptr<content::ZoomLevelDelegate>