DevTools: Switch to using fast stack iterator to collect stacks during timeline recording.

third_party/WebKit/Source/modules/websockets/InspectorWebSocketEvents.cpp

 // Copyright 2014 The Chromium 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 "modules/websockets/InspectorWebSocketEvents.h"
 
 #include "core/dom/Document.h"
 #include "platform/TracedValue.h"
 #include "platform/weborigin/KURL.h"
 
 namespace blink {
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorWebSocketCreateEvent::data(Document* document, unsigned long identifier, const KURL& url, const String& protocol)
 {
     RefPtr<TracedValue> value = TracedValue::create();
     value->setInteger("identifier", identifier);
     value->setString("url", url.string());
     value->setString("frame", toHexString(document->frame()));
     if (!protocol.isNull())
         value->setString("webSocketProtocol", protocol);
-    setCallStack(value.get());
+    requestCallStackSample();
     return value.release();
 }
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> InspectorWebSocketEvent::data(Document* document, unsigned long identifier)
 {
     RefPtr<TracedValue> value = TracedValue::create();
     value->setInteger("identifier", identifier);
     value->setString("frame", toHexString(document->frame()));
-    setCallStack(value.get());
+    requestCallStackSample();
     return value.release();
 }
 
 } // namespace blink