Reland "Implement Math.random() purely in JavaScript" plus fixes.

src/v8.h

Index: src/v8.h
diff --git a/src/v8.h b/src/v8.h
index 6f2633aa86522595f7a580b4af1197281dc1d9d3..8069e8adda2106b1749ae4b7f118210b4917a058 100644
--- a/src/v8.h
+++ b/src/v8.h
@@ -96,8 +96,6 @@ class V8 : public AllStatic {
       ReturnAddressLocationResolver resolver);
   // Support for entry hooking JITed code.
   static void SetFunctionEntryHook(FunctionEntryHook entry_hook);
-  // Random number generation support. Not cryptographically safe.
-  static uint32_t Random(Context* context);
 
   static void AddCallCompletedCallback(CallCompletedCallback callback);
   static void RemoveCallCompletedCallback(CallCompletedCallback callback);