Oilpan: trace part objects as per the GC plugin's wishes.

Following https://src.chromium.org/viewvc/chrome?view=rev&revision=287310,
the Blink clang plugin insists that part objects are to be traced
via Visitor's fallback method

  template<typename T>void trace(const T& t);

Fix up some uses that were not.

R=haraken
BUG=340522
NOTRY=true

Review URL: https://codereview.chromium.org/471463002

git-svn-id: svn://svn.chromium.org/blink/trunk@180152 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/inspector/InspectorController.cpp

@@ -144,7 +144,7 @@ void InspectorController::trace(Visitor* visitor)
     visitor->trace(m_tracingAgent);
     visitor->trace(m_inspectorFrontendClient);
     visitor->trace(m_page);
-    m_agents.trace(visitor);
+    visitor->trace(m_agents);
 }
 
 PassOwnPtrWillBeRawPtr<InspectorController> InspectorController::create(Page* page, InspectorClient* client)

third_party/WebKit/Source/core/inspector/WorkerInspectorController.cpp

@@ -183,7 +183,7 @@ void WorkerInspectorController::trace(Visitor* visitor)
     visitor->trace(m_state);
     visitor->trace(m_instrumentingAgents);
     visitor->trace(m_injectedScriptManager);
-    m_agents.trace(visitor);
+    visitor->trace(m_agents);
     visitor->trace(m_workerDebuggerAgent);
 }