[isolate] Remove unused exception handle

src/isolate.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/isolate.h"
 
 #include <stdlib.h>
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
@@ skipping 2972 matching lines @@
   queue->set(num_tasks, *microtask);
   set_pending_microtask_count(num_tasks + 1);
 }
 
 
 void Isolate::RunMicrotasks() {
   // Increase call depth to prevent recursive callbacks.
   v8::Isolate::SuppressMicrotaskExecutionScope suppress(
       reinterpret_cast<v8::Isolate*>(this));
   is_running_microtasks_ = true;
-  RunMicrotasksInternal();
+  MaybeHandle<Object> maybe_exception;
+  MaybeHandle<Object> result = Execution::TryCall(
+      this, microtask_run(), factory()->undefined_value(), 0, NULL,
+      &maybe_exception);
+  //RunMicrotasksInternal();
   is_running_microtasks_ = false;
   FireMicrotasksCompletedCallback();
 }
 
 
 void Isolate::RunMicrotasksInternal() {
   while (pending_microtask_count() > 0) {
     HandleScope scope(this);
     int num_tasks = pending_microtask_count();
     Handle<FixedArray> queue(heap()->microtask_queue(), this);
@@ skipping 10 matching lines @@
         SaveContext save(this);
         set_context(microtask_function->context()->native_context());
         handle_scope_implementer_->EnterMicrotaskContext(
             handle(microtask_function->context(), this));
         MaybeHandle<Object> maybe_exception;
         MaybeHandle<Object> result = Execution::TryCall(
             this, microtask_function, factory()->undefined_value(), 0, NULL,
             &maybe_exception);
         handle_scope_implementer_->LeaveMicrotaskContext();
         // If execution is terminating, just bail out.
-        Handle<Object> exception;
         if (result.is_null() && maybe_exception.is_null()) {
           // Clear out any remaining callbacks in the queue.
           heap()->set_microtask_queue(heap()->empty_fixed_array());
           set_pending_microtask_count(0);
           return;
         }
       } else {
         Handle<CallHandlerInfo> callback_info =
             Handle<CallHandlerInfo>::cast(microtask);
         v8::MicrotaskCallback callback =
@@ skipping 170 matching lines @@
   // Then check whether this scope intercepts.
   if ((flag & intercept_mask_)) {
     intercepted_flags_ |= flag;
     return true;
   }
   return false;
 }
 
 }  // namespace internal
 }  // namespace v8