Javascript interpreter supports for JSC and V8 simultaneously.

Before, one had to build two different versions.

Tools/javascript/js_shell.h

@@ -10,7 +10,7 @@ class JSShell {
 
 public:
   enum Engine {
-    JSC,
+    JSC = 0,
     V8
   };
 
@@ -20,7 +20,7 @@ public:
 
   virtual ~JSShell() = 0;
 
-  static JSShell* Create();
+  static JSShell* Create(Engine engine = JSC);
 
   bool ImportModule(const std::string& name);
 
@@ -46,6 +46,4 @@ protected:
 
 };
 
-typedef JSShell* (*JSShellFactory)();
-
 #endif // JS_SHELL_H