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

chrome/common/pref_names.cc

 // Copyright (c) 2012 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/common/pref_names.h"
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
@@ skipping 1281 matching lines @@
 // String containing the version of Chrome that the profile was created by.
 // If profile was created before this feature was added, this pref will default
 // to "1.0.0.0".
 const char kProfileCreatedByVersion[] = "profile.created_by_version";
 
 // A map of profile data directory to cached information. This cache can be
 // used to display information about profiles without actually having to load
 // them.
 const char kProfileInfoCache[] = "profile.info_cache";
 
-// Boolean that specifies whether or not crash reports are sent
-// over the network for analysis.
-#if defined(OS_ANDROID)
+// Deprecated preference for metric / crash reporting on Android. Use
+// kMetricsReportingEnabled instead.
+#if BUILDFLAG(ANDROID_JAVA_UI)
 const char kCrashReportingEnabled[] =
     "user_experience_metrics_crash.reporting_enabled";
 #endif
 
 // This is the location of a list of dictionaries of plugin stability stats.
 const char kStabilityPluginStats[] =
     "user_experience_metrics.stability.plugin_stats2";
 
 // On Chrome OS, total number of non-Chrome user process crashes
 // since the last report.
@@ skipping 937 matching lines @@
 const char kOriginTrialPublicKey[] = "origin_trials.public_key";
 
 // A list of origin trial features to disable by policy.
 const char kOriginTrialDisabledFeatures[] = "origin_trials.disabled_features";
 
 // Policy that indicates the state of updates for the binary components.
 const char kComponentUpdatesEnabled[] =
     "component_updates.component_updates_enabled";
 
 }  // namespace prefs