Revert of Background tracing: Tracing scenarios can now enable/disable Blink features, for A/B testing purpos…

content/browser/tracing/background_tracing_config_impl.cc

Index: content/browser/tracing/background_tracing_config_impl.cc
diff --git a/content/browser/tracing/background_tracing_config_impl.cc b/content/browser/tracing/background_tracing_config_impl.cc
index 720656a24dab4517850e176f971d8b3fdb990c08..cc944ce90ef6a624284c8c43f8fbf29d0f9d2a2f 100644
--- a/content/browser/tracing/background_tracing_config_impl.cc
+++ b/content/browser/tracing/background_tracing_config_impl.cc
@@ -16,10 +16,6 @@
 const char kConfigModeKey[] = "mode";
 const char kConfigModePreemptive[] = "PREEMPTIVE_TRACING_MODE";
 const char kConfigModeReactive[] = "REACTIVE_TRACING_MODE";
-
-const char kConfigScenarioName[] = "scenario_name";
-const char kConfigEnableBlinkFeatures[] = "enable_blink_features";
-const char kConfigDisableBlinkFeatures[] = "disable_blink_features";
 
 const char kConfigCategoryKey[] = "category";
 const char kConfigCategoryBenchmark[] = "BENCHMARK";
@@ -107,13 +103,6 @@
   }
 
   dict->Set(kConfigsKey, configs_list.Pass());
-
-  if (!scenario_name_.empty())
-    dict->SetString(kConfigScenarioName, scenario_name_);
-  if (!enable_blink_features_.empty())
-    dict->SetString(kConfigEnableBlinkFeatures, enable_blink_features_);
-  if (!disable_blink_features_.empty())
-    dict->SetString(kConfigDisableBlinkFeatures, disable_blink_features_);
 }
 
 void BackgroundTracingConfigImpl::AddPreemptiveRule(
@@ -151,11 +140,6 @@
     return nullptr;
   }
 
-  dict->GetString(kConfigScenarioName, &config->scenario_name_);
-  dict->GetString(kConfigEnableBlinkFeatures, &config->enable_blink_features_);
-  dict->GetString(kConfigDisableBlinkFeatures,
-                  &config->disable_blink_features_);
-
   return config.Pass();
 }