Move platform abstraction to base library

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

 // 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.
 
-#ifndef V8_UTILS_RANDOM_NUMBER_GENERATOR_H_
-#define V8_UTILS_RANDOM_NUMBER_GENERATOR_H_
+#ifndef V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
+#define V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_
 
 #include "src/base/macros.h"
 
 namespace v8 {
-namespace internal {
+namespace base {
 
 // -----------------------------------------------------------------------------
 // RandomNumberGenerator
 //
 // This class is used to generate a stream of pseudorandom numbers. The class
 // uses a 48-bit seed, which is modified using a linear congruential formula.
 // (See Donald Knuth, The Art of Computer Programming, Volume 3, Section 3.2.1.)
 // If two instances of RandomNumberGenerator are created with the same seed, and
 // the same sequence of method calls is made for each, they will generate and
 // return identical sequences of numbers.
@@ skipping 55 matching lines @@
  private:
   static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d);
   static const int64_t kAddend = 0xb;
   static const int64_t kMask = V8_2PART_UINT64_C(0xffff, ffffffff);
 
   int Next(int bits) V8_WARN_UNUSED_RESULT;
 
   int64_t seed_;
 };
 
-} }  // namespace v8::internal
+} }  // namespace v8::base
 
-#endif  // V8_UTILS_RANDOM_NUMBER_GENERATOR_H_
+#endif  // V8_BASE_UTILS_RANDOM_NUMBER_GENERATOR_H_