removed some unnecessary stuff from d8's initialization

src/d8.h

Index: src/d8.h
diff --git a/src/d8.h b/src/d8.h
index e62ce3803642a17e9fcc339acbd0bb77dc52e2e4..7d0f49e9ff81e2c30570dcbe65c91c59db0b2de1 100644
--- a/src/d8.h
+++ b/src/d8.h
@@ -129,7 +129,7 @@ class Shell: public i::AllStatic {
   static void AddHistogramSample(void* histogram, int sample);
   static void MapCounters(const char* name);
   static Handle<String> ReadFile(const char* name);
-  static void Initialize();
+  static void Initialize(bool test_shell);
   static void RenewEvaluationContext();
   static void InstallUtilityScript();
   static void RunShell();
@@ -202,8 +202,6 @@ class Shell: public i::AllStatic {
 
   static void AddOSMethods(Handle<ObjectTemplate> os_template);
 
-  static Handle<Context> utility_context() { return utility_context_; }
-
   static const char* kHistoryFileName;
   static const char* kPrompt;