Revert "Require V8 to be explicitly initialized before an Isolate is created"

src/base/utils/random-number-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/utils/random-number-generator.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 
 #include <new>
@@ skipping 107 matching lines @@
   // Assigning a uint64_t to an int64_t is implementation defined, but this
   // should be OK. Use a static_cast to explicitly state that we know what we're
   // doing. (Famous last words...)
   int64_t seed = static_cast<int64_t>((product + kAddend) & kMask);
   seed_ = seed;
   return static_cast<int>(seed >> (48 - bits));
 }
 
 
 void RandomNumberGenerator::SetSeed(int64_t seed) {
-  initial_seed_ = seed;
   seed_ = (seed ^ kMultiplier) & kMask;
 }
 
 } }  // namespace v8::base