Drop GetCurrentThreadId() and TerminateExecution(int) from the external API.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index ba4d19b01d45bba7981f4849eafcd81acc49ad37..be838c2b22045f6fcaaf527012118ef645153b61 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4592,40 +4592,6 @@ class V8_EXPORT V8 {
       intptr_t change_in_bytes);
 
   /**
-   * Retrieve the V8 thread id of the calling thread.
-   *
-   * The thread id for a thread should only be retrieved after the V8
-   * lock has been acquired with a Locker object with that thread.
-   */
-  static int GetCurrentThreadId();
-
-  /**
-   * Forcefully terminate execution of a JavaScript thread.  This can
-   * be used to terminate long-running scripts.
-   *
-   * TerminateExecution should only be called when then V8 lock has
-   * been acquired with a Locker object.  Therefore, in order to be
-   * able to terminate long-running threads, preemption must be
-   * enabled to allow the user of TerminateExecution to acquire the
-   * lock.
-   *
-   * The termination is achieved by throwing an exception that is
-   * uncatchable by JavaScript exception handlers.  Termination
-   * exceptions act as if they were caught by a C++ TryCatch exception
-   * handler.  If forceful termination is used, any C++ TryCatch
-   * exception handler that catches an exception should check if that
-   * exception is a termination exception and immediately return if
-   * that is the case.  Returning immediately in that case will
-   * continue the propagation of the termination exception if needed.
-   *
-   * The thread id passed to TerminateExecution must have been
-   * obtained by calling GetCurrentThreadId on the thread in question.
-   *
-   * \param thread_id The thread id of the thread to terminate.
-   */
-  static void TerminateExecution(int thread_id);
-
-  /**
    * Forcefully terminate the current thread of JavaScript execution
    * in the given isolate. If no isolate is provided, the default
    * isolate is used.