Refactor UKM interface for mojo-ification

chrome/browser/metrics/chrome_metrics_service_client.cc

 // 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.
 
 #include "chrome/browser/metrics/chrome_metrics_service_client.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <utility>
@@ skipping 263 matching lines @@
   wchar_t exe_file[MAX_PATH] = {};
   CHECK(::GetModuleFileName(nullptr, exe_file, arraysize(exe_file)));
 
   base::string16 unused_special_build;
   install_static::GetExecutableVersionDetails(
       exe_file, product_name, version_number, &unused_special_build,
       channel_name);
 }
 #endif  // OS_WIN
 
-ukm::UkmService* BindableGetUkmService() {
-  return g_browser_process->ukm_service();
+ukm::UkmService* BindableGetUkmService(
+    base::WeakPtr<ChromeMetricsServiceClient> weak_ptr) {
+  if (!weak_ptr)
+    return nullptr;
+  return weak_ptr->GetUkmService();
 }
 
 }  // namespace
 
 const char ChromeMetricsServiceClient::kBrowserMetricsName[] = "BrowserMetrics";
 
 ChromeMetricsServiceClient::ChromeMetricsServiceClient(
     metrics::MetricsStateManager* state_manager)
     : metrics_state_manager_(state_manager),
 #if defined(OS_CHROMEOS)
@@ skipping 632 matching lines @@
                  content::NotificationService::AllBrowserContextsAndSources());
   for (Profile* profile :
        g_browser_process->profile_manager()->GetLoadedProfiles()) {
     RegisterForProfileEvents(profile);
   }
 }
 
 void ChromeMetricsServiceClient::RegisterForProfileEvents(Profile* profile) {
   // Register chrome://ukm handler
   content::URLDataSource::Add(
-      profile, new ukm::debug::DebugPage(base::Bind(&BindableGetUkmService)));
+      profile, new ukm::debug::DebugPage(base::Bind(
+                   &BindableGetUkmService, weak_ptr_factory_.GetWeakPtr())));
 #if defined(OS_CHROMEOS)
   // Ignore the signin profile for sync disables / history deletion.
   if (chromeos::ProfileHelper::IsSigninProfile(profile))
     return;
 #endif
   history::HistoryService* history_service =
       HistoryServiceFactory::GetForProfile(profile,
                                            ServiceAccessType::IMPLICIT_ACCESS);
   ObserveServiceForDeletions(history_service);
   browser_sync::ProfileSyncService* sync =
@@ skipping 49 matching lines @@
     ukm_service_->Purge();
     ukm_service_->ResetClientId();
   }
   // Signal service manager to enable/disable UKM based on new state.
   UpdateRunningServices();
 }
 
 bool ChromeMetricsServiceClient::IsHistorySyncEnabledOnAllProfiles() {
   return SyncDisableObserver::IsHistorySyncEnabledOnAllProfiles();
 }