Move platform abstraction to base library

src/isolate-inl.h

Index: src/isolate-inl.h
diff --git a/src/isolate-inl.h b/src/isolate-inl.h
index 12a861f2b8961653c63566bef388735739c2db83..b44c4d6d723606764d4a9bdebba38d893598710d 100644
--- a/src/isolate-inl.h
+++ b/src/isolate-inl.h
@@ -5,9 +5,9 @@
 #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 {
@@ -30,12 +30,13 @@ bool Isolate::DebuggerHasBreakPoints() {
 }
 
 
-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_;