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

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

Index: src/base/utils/random-number-generator.h
diff --git a/src/base/utils/random-number-generator.h b/src/base/utils/random-number-generator.h
index 479423d65864bdde345e77cdcc5d4b2393f4aa0c..a9107a6d061382b4c154da7e09d9cd9619919f65 100644
--- a/src/base/utils/random-number-generator.h
+++ b/src/base/utils/random-number-generator.h
@@ -74,8 +74,6 @@ class RandomNumberGenerator FINAL {
   // Override the current ssed.
   void SetSeed(int64_t seed);
 
-  int64_t initial_seed() const { return initial_seed_; }
-
  private:
   static const int64_t kMultiplier = V8_2PART_UINT64_C(0x5, deece66d);
   static const int64_t kAddend = 0xb;
@@ -83,7 +81,6 @@ class RandomNumberGenerator FINAL {
 
   int Next(int bits) WARN_UNUSED_RESULT;
 
-  int64_t initial_seed_;
   int64_t seed_;
 };