tracing: remove sampling state profiler

src/d8.cc

Index: src/d8.cc
diff --git a/src/d8.cc b/src/d8.cc
index 01801f80f6d30a158e944a992e0c823b1741f04e..a65e41c13e42d7e1369476a8ea48d79dccdbef05 100644
--- a/src/d8.cc
+++ b/src/d8.cc
@@ -196,7 +196,6 @@ const char kRecordContinuously[] = "record-continuously";
 const char kRecordAsMuchAsPossible[] = "record-as-much-as-possible";
 
 const char kRecordModeParam[] = "record_mode";
-const char kEnableSamplingParam[] = "enable_sampling";
 const char kEnableSystraceParam[] = "enable_systrace";
 const char kEnableArgumentFilterParam[] = "enable_argument_filter";
 const char kIncludedCategoriesParam[] = "included_categories";
@@ -221,10 +220,6 @@ class TraceConfigParser {
     trace_config->SetTraceRecordMode(
         GetTraceRecordMode(isolate, context, trace_config_object));
     if (GetBoolean(isolate, context, trace_config_object,
-                   kEnableSamplingParam)) {
-      trace_config->EnableSampling();
-    }
-    if (GetBoolean(isolate, context, trace_config_object,
                    kEnableSystraceParam)) {
       trace_config->EnableSystrace();
     }