Introduce a RandonNumberGenerator class. Refactor the random/private_random uses in Isolate/Context.

src/platform-linux.cc

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 // modification, are permitted provided that the following conditions are
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 //
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@@ skipping 448 matching lines @@
 
 bool VirtualMemory::ReleaseRegion(void* base, size_t size) {
   return munmap(base, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   return true;
 }
 
-
-void OS::SetUp() {
-  // Seed the random number generator. We preserve microsecond resolution.
-  uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis()) ^ (getpid() << 16);
-  srandom(static_cast<unsigned int>(seed));
-}
-
-
 } }  // namespace v8::internal