Clean up UMA 3g experiment and unify metrics enabled pref for Android

chrome/browser/metrics/chrome_metrics_service_accessor.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_accessor.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/common/features.h"
 #include "chrome/common/pref_names.h"
@@ skipping 31 matching lines @@
       content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
   // This is only possible during unit tests. If the unit test didn't set the
   // local_state then it doesn't care about pref value and therefore we return
   // false.
   if (!g_browser_process->local_state()) {
     DLOG(WARNING) << "Local state has not been set and pref cannot be read";
     return false;
   }
 
-#if !BUILDFLAG(ANDROID_JAVA_UI)
   return IsMetricsReportingEnabled(g_browser_process->local_state());
-#else
-  // Android currently obtain the value for whether the user has
-  // obtain metrics reporting in non-standard ways.
-  // TODO(gayane): Consolidate metric prefs on all platforms and eliminate this
-  // special-case code, instead having all platforms go through the above flow.
-  // http://crbug.com/362192, http://crbug.com/532084
-  bool pref_value = false;
-
-  pref_value = g_browser_process->local_state()->GetBoolean(
-      prefs::kCrashReportingEnabled);
-  return IsMetricsReportingEnabledWithPrefValue(pref_value);
-#endif  // !BUILDFLAG(ANDROID_JAVA_UI)
 }
 
 // static
 bool ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrial(
     const std::string& trial_name,
     const std::string& group_name) {
   return metrics::MetricsServiceAccessor::RegisterSyntheticFieldTrial(
       g_browser_process->metrics_service(), trial_name, group_name);
 }
 
 // static
 bool ChromeMetricsServiceAccessor::RegisterSyntheticMultiGroupFieldTrial(
     const std::string& trial_name,
     const std::vector<uint32_t>& group_name_hashes) {
   return metrics::MetricsServiceAccessor::RegisterSyntheticMultiGroupFieldTrial(
       g_browser_process->metrics_service(), trial_name, group_name_hashes);
 }
 
 // static
 bool ChromeMetricsServiceAccessor::RegisterSyntheticFieldTrialWithNameHash(
     uint32_t trial_name_hash,
     const std::string& group_name) {
   return metrics::MetricsServiceAccessor::
       RegisterSyntheticFieldTrialWithNameHash(
           g_browser_process->metrics_service(), trial_name_hash, group_name);
 }