Oilpan: Prepare moving InspectorFrontendHost to Oilpan

Source/web/InspectorFrontendClientImpl.cpp

Index: Source/web/InspectorFrontendClientImpl.cpp
diff --git a/Source/web/InspectorFrontendClientImpl.cpp b/Source/web/InspectorFrontendClientImpl.cpp
index dec64f2ae13ef0385262df036f12230f2bab36bd..b8c312d3c0f4bcbe0799cda7bf06722044686d18 100644
--- a/Source/web/InspectorFrontendClientImpl.cpp
+++ b/Source/web/InspectorFrontendClientImpl.cpp
@@ -54,8 +54,22 @@ InspectorFrontendClientImpl::InspectorFrontendClientImpl(Page* frontendPage, Web
 
 InspectorFrontendClientImpl::~InspectorFrontendClientImpl()
 {
-    if (m_frontendHost)
+    ASSERT(!m_frontendHost);
+}
+
+void InspectorFrontendClientImpl::trace(Visitor* visitor)
+{
+    visitor->trace(m_frontendPage);
+    visitor->trace(m_frontendHost);
+    InspectorFrontendClient::trace(visitor);
+}
+
+void InspectorFrontendClientImpl::dispose()
+{
+    if (m_frontendHost) {
         m_frontendHost->disconnectClient();
+        m_frontendHost = nullptr;
+    }
     m_client = 0;
 }