Introduce a RandonNumberGenerator class. Refactor the random/private_random uses in Isolate/Context.

src/v8.h

Index: src/v8.h
diff --git a/src/v8.h b/src/v8.h
index 23277b39af3b0529544fe62cb1c39b5efe40eedc..5848f748185e27c7ce4ceaaf1deaccf139d24a7b 100644
--- a/src/v8.h
+++ b/src/v8.h
@@ -97,11 +97,6 @@ class V8 : public AllStatic {
   static void SetFunctionEntryHook(FunctionEntryHook entry_hook);
   // Random number generation support. Not cryptographically safe.
   static uint32_t Random(Context* context);
-  // We use random numbers internally in memory allocation and in the
-  // compilers for security. In order to prevent information leaks we
-  // use a separate random state for internal random number
-  // generation.
-  static uint32_t RandomPrivate(Isolate* isolate);
   static Object* FillHeapNumberWithRandom(Object* heap_number,
                                           Context* context);