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

src/snapshot.h

Index: src/snapshot.h
diff --git a/src/snapshot.h b/src/snapshot.h
index 3d752a72aa745f1f57a2aaee6d637645617743bf..b785cf57008999f622b1d466314e9239a76a2f67 100644
--- a/src/snapshot.h
+++ b/src/snapshot.h
@@ -12,9 +12,9 @@ namespace internal {
 
 class Snapshot {
  public:
-  // Initialize the Isolate from the internal snapshot. Returns false if no
-  // snapshot could be found.
-  static bool Initialize(Isolate* isolate);
+  // Initialize the VM from the internal snapshot. Returns false if no snapshot
+  // could be found.
+  static bool Initialize();
 
   static bool HaveASnapshotToStartFrom();