Oilpan: Fix compile after r200678.

Source/core/inspector/InspectorDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDebuggerAgent.cpp b/Source/core/inspector/InspectorDebuggerAgent.cpp
index 2f56ffb4cc82c59bd94a3c8eeb1a82345cc99630..a1017fe481fe1ae90fd8bb547fa6807dc3b52ce9 100644
--- a/Source/core/inspector/InspectorDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDebuggerAgent.cpp
@@ -38,7 +38,7 @@ namespace blink {
 
 InspectorDebuggerAgent::InspectorDebuggerAgent(InjectedScriptManager* injectedScriptManager, V8Debugger* debugger, int contextGroupId)
     : InspectorBaseAgent<InspectorDebuggerAgent, InspectorFrontend::Debugger>("Debugger")
-    , m_v8DebuggerAgent(adoptPtr(new V8DebuggerAgent(injectedScriptManager, debugger, this, contextGroupId)))
+    , m_v8DebuggerAgent(adoptPtrWillBeNoop(new V8DebuggerAgent(injectedScriptManager, debugger, this, contextGroupId)))
 {
 }
 
@@ -49,6 +49,12 @@ InspectorDebuggerAgent::~InspectorDebuggerAgent()
 #endif
 }
 
+DEFINE_TRACE(InspectorDebuggerAgent)
+{
+    visitor->trace(m_v8DebuggerAgent);
+    InspectorBaseAgent<InspectorDebuggerAgent, InspectorFrontend::Debugger>::trace(visitor);
+}
+
 // Protocol implementation.
 void InspectorDebuggerAgent::enable(ErrorString* errorString)
 {