DevTools: make InspectorDebuggerAgent aggregate V8DebuggerAgent instead of inheriting

Source/core/inspector/WorkerInspectorController.cpp

Index: Source/core/inspector/WorkerInspectorController.cpp
diff --git a/Source/core/inspector/WorkerInspectorController.cpp b/Source/core/inspector/WorkerInspectorController.cpp
index 503328b7350568fbdb5a865ba400f3de098e035a..0e7efb421ba5c526bffd7875e253292f10bb4bae 100644
--- a/Source/core/inspector/WorkerInspectorController.cpp
+++ b/Source/core/inspector/WorkerInspectorController.cpp
@@ -135,7 +135,7 @@ WorkerInspectorController::WorkerInspectorController(WorkerGlobalScope* workerGl
     OwnPtrWillBeRawPtr<WorkerDebuggerAgent> workerDebuggerAgent = WorkerDebuggerAgent::create(m_workerThreadDebugger.get(), workerGlobalScope, m_injectedScriptManager.get());
     m_workerDebuggerAgent = workerDebuggerAgent.get();
     m_agents.append(workerDebuggerAgent.release());
-    m_asyncCallTracker = adoptPtrWillBeNoop(new AsyncCallTracker(m_workerDebuggerAgent, m_instrumentingAgents.get()));
+    m_asyncCallTracker = adoptPtrWillBeNoop(new AsyncCallTracker(m_workerDebuggerAgent->v8DebuggerAgent(), m_instrumentingAgents.get()));
 
     v8::Isolate* isolate = workerGlobalScope->thread()->isolate();
     m_agents.append(InspectorProfilerAgent::create(isolate, m_injectedScriptManager.get(), 0));
@@ -143,12 +143,12 @@ WorkerInspectorController::WorkerInspectorController(WorkerGlobalScope* workerGl
 
     OwnPtrWillBeRawPtr<WorkerConsoleAgent> workerConsoleAgent = WorkerConsoleAgent::create(m_injectedScriptManager.get(), workerGlobalScope);
     WorkerConsoleAgent* workerConsoleAgentPtr = workerConsoleAgent.get();
-    workerConsoleAgentPtr->setDebuggerAgent(m_workerDebuggerAgent);
+    workerConsoleAgentPtr->setDebuggerAgent(m_workerDebuggerAgent->v8DebuggerAgent());
     m_agents.append(workerConsoleAgent.release());
 
     m_agents.append(InspectorTimelineAgent::create());
 
-    m_injectedScriptManager->injectedScriptHost()->init(workerConsoleAgentPtr, m_workerDebuggerAgent, nullptr, m_workerThreadDebugger->debugger(), adoptPtr(new WorkerInjectedScriptHostClient()));
+    m_injectedScriptManager->injectedScriptHost()->init(workerConsoleAgentPtr, m_workerDebuggerAgent->v8DebuggerAgent(), nullptr, m_workerThreadDebugger->debugger(), adoptPtr(new WorkerInjectedScriptHostClient()));
 }
 
 WorkerInspectorController::~WorkerInspectorController()