Revert of [inspector] use creation stack trace as parent for async call chains

src/inspector/v8-debugger.cc

Index: src/inspector/v8-debugger.cc
diff --git a/src/inspector/v8-debugger.cc b/src/inspector/v8-debugger.cc
index a65cc738e34f2acc4e3f3fae9dc9acb847a1bac4..f65b590b04cf4979036a40af5a309efeeaa96065 100644
--- a/src/inspector/v8-debugger.cc
+++ b/src/inspector/v8-debugger.cc
@@ -683,15 +683,12 @@
 }
 
 std::shared_ptr<AsyncStackTrace> V8Debugger::currentAsyncParent() {
-  // TODO(kozyatinskiy): implement creation chain as parent without hack.
-  if (!m_currentAsyncCreation.empty() && m_currentAsyncCreation.back()) {
-    return m_currentAsyncCreation.back();
-  }
   return m_currentAsyncParent.empty() ? nullptr : m_currentAsyncParent.back();
 }
 
 std::shared_ptr<AsyncStackTrace> V8Debugger::currentAsyncCreation() {
-  return nullptr;
+  return m_currentAsyncCreation.empty() ? nullptr
+                                        : m_currentAsyncCreation.back();
 }
 
 void V8Debugger::compileDebuggerScript() {
@@ -859,8 +856,7 @@
   if (parentTask) m_parentTask[task] = parentTask;
   v8::HandleScope scope(m_isolate);
   std::shared_ptr<AsyncStackTrace> asyncCreation =
-      AsyncStackTrace::capture(this, currentContextGroupId(), String16(),
-                               V8StackTraceImpl::maxCallStackSizeToCapture);
+      AsyncStackTrace::capture(this, currentContextGroupId(), String16(), 1);
   // Passing one as maxStackSize forces no async chain for the new stack.
   if (asyncCreation && !asyncCreation->isEmpty()) {
     m_asyncTaskCreationStacks[task] = asyncCreation;
@@ -936,12 +932,6 @@
   auto itCreation = m_asyncTaskCreationStacks.find(task);
   if (itCreation != m_asyncTaskCreationStacks.end()) {
     m_currentAsyncCreation.push_back(itCreation->second.lock());
-    // TODO(kozyatinskiy): implement it without hack.
-    if (m_currentAsyncParent.back()) {
-      m_currentAsyncCreation.back()->setDescription(
-          m_currentAsyncParent.back()->description());
-      m_currentAsyncParent.back().reset();
-    }
   } else {
     m_currentAsyncCreation.emplace_back();
   }