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

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 26d87102aacd58658c98982efb0b7b805209e603..e4c7087d304d8d88da2b7f12a7c903566021805f 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4344,12 +4344,13 @@ typedef void (*JitCodeEventHandler)(const JitCodeEvent* event);
 
 
 /**
- * Isolate represents an isolated instance of the V8 engine.  V8 isolates have
- * completely separate states.  Objects from one isolate must not be used in
- * other isolates.  The embedder can create multiple isolates and use them in
- * parallel in multiple threads.  An isolate can be entered by at most one
- * thread at any given time.  The Locker/Unlocker API must be used to
- * synchronize.
+ * Isolate represents an isolated instance of the V8 engine.  V8
+ * isolates have completely separate states.  Objects from one isolate
+ * must not be used in other isolates.  When V8 is initialized a
+ * default isolate is implicitly created and entered.  The embedder
+ * can create additional isolates and use them in parallel in multiple
+ * threads.  An isolate can be entered by at most one thread at any
+ * given time.  The Locker/Unlocker API must be used to synchronize.
  */
 class V8_EXPORT Isolate {
  public:
@@ -4357,10 +4358,7 @@ class V8_EXPORT Isolate {
    * Initial configuration parameters for a new Isolate.
    */
   struct CreateParams {
-    CreateParams()
-        : entry_hook(NULL),
-          code_event_handler(NULL),
-          enable_serializer(false) {}
+    CreateParams() : entry_hook(NULL), code_event_handler(NULL) {}
 
     /**
      * The optional entry_hook allows the host application to provide the
@@ -4381,11 +4379,6 @@ class V8_EXPORT Isolate {
      * ResourceConstraints to use for the new Isolate.
      */
     ResourceConstraints constraints;
-
-    /**
-     * This flag currently renders the Isolate unusable.
-     */
-    bool enable_serializer;
   };
 
 
@@ -4496,8 +4489,6 @@ class V8_EXPORT Isolate {
    *
    * When an isolate is no longer used its resources should be freed
    * by calling Dispose().  Using the delete operator is not allowed.
-   *
-   * V8::Initialize() must have run prior to this.
    */
   static Isolate* New(const CreateParams& params = CreateParams());
 
@@ -5111,8 +5102,9 @@ class V8_EXPORT V8 {
   static void RemoveMemoryAllocationCallback(MemoryAllocationCallback callback);
 
   /**
-   * Initializes V8. This function needs to be called before the first Isolate
-   * is created. It always returns true.
+   * Initializes from snapshot if possible. Otherwise, attempts to
+   * initialize from scratch.  This function is called implicitly if
+   * you use the API without calling it first.
    */
   static bool Initialize();