Move platform abstraction to base library

src/isolate-inl.h

 // Copyright 2011 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_ISOLATE_INL_H_
 #define V8_ISOLATE_INL_H_
 
+#include "src/base/utils/random-number-generator.h"
 #include "src/debug.h"
 #include "src/isolate.h"
-#include "src/utils/random-number-generator.h"
 
 namespace v8 {
 namespace internal {
 
 
 SaveContext::SaveContext(Isolate* isolate)
   : isolate_(isolate),
     prev_(isolate->save_context()) {
   if (isolate->context() != NULL) {
     context_ = Handle<Context>(isolate->context());
   }
   isolate->set_save_context(this);
 
   c_entry_fp_ = isolate->c_entry_fp(isolate->thread_local_top());
 }
 
 
 bool Isolate::DebuggerHasBreakPoints() {
   return debug()->has_break_points();
 }
 
 
-RandomNumberGenerator* Isolate::random_number_generator() {
+base::RandomNumberGenerator* Isolate::random_number_generator() {
   if (random_number_generator_ == NULL) {
     if (FLAG_random_seed != 0) {
-      random_number_generator_ = new RandomNumberGenerator(FLAG_random_seed);
+      random_number_generator_ =
+          new base::RandomNumberGenerator(FLAG_random_seed);
     } else {
-      random_number_generator_ = new RandomNumberGenerator();
+      random_number_generator_ = new base::RandomNumberGenerator();
     }
   }
   return random_number_generator_;
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_INL_H_