DevTools: extract V8DebuggerAgent interface, move it under .../inspector/v8

third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp

Index: third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
index 49662c054ad77d21393257b012c4747adb259a9e..73e52f5082623e5583e27be9cf96d5fc7d3b02ac 100644
--- a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
+++ b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
@@ -38,7 +38,6 @@
 #include "core/frame/FrameConsole.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
-#include "core/inspector/AsyncCallTracker.h"
 #include "core/inspector/IdentifiersFactory.h"
 #include "core/inspector/InjectedScriptHost.h"
 #include "core/inspector/InjectedScriptManager.h"
@@ -410,7 +409,6 @@ DEFINE_TRACE(WebDevToolsAgentImpl)
     visitor->trace(m_resourceContentLoader);
     visitor->trace(m_state);
     visitor->trace(m_overlay);
-    visitor->trace(m_asyncCallTracker);
     visitor->trace(m_inspectorAgent);
     visitor->trace(m_domAgent);
     visitor->trace(m_pageAgent);
@@ -464,7 +462,6 @@ void WebDevToolsAgentImpl::initializeDeferredAgents()
     OwnPtrWillBeRawPtr<InspectorDebuggerAgent> debuggerAgentPtr(PageDebuggerAgent::create(MainThreadDebugger::instance(), m_pageAgent, injectedScriptManager));
     InspectorDebuggerAgent* debuggerAgent = debuggerAgentPtr.get();
     m_agents.append(debuggerAgentPtr.release());
-    m_asyncCallTracker = adoptPtrWillBeNoop(new AsyncCallTracker(debuggerAgent->v8DebuggerAgent(), m_instrumentingAgents.get()));
 
     m_agents.append(InspectorDOMDebuggerAgent::create(injectedScriptManager, m_domAgent, debuggerAgent->v8DebuggerAgent()));