Oilpan: fix build after r181083

Source/core/frame/FrameConsole.cpp

Index: Source/core/frame/FrameConsole.cpp
diff --git a/Source/core/frame/FrameConsole.cpp b/Source/core/frame/FrameConsole.cpp
index 0f0fcbd7b4f0c4eabd5e23b38ba1505530d9103d..adacbedd33a95734cbeddb61136091c1e5425c49 100644
--- a/Source/core/frame/FrameConsole.cpp
+++ b/Source/core/frame/FrameConsole.cpp
@@ -55,10 +55,6 @@ FrameConsole::FrameConsole(LocalFrame& frame)
 {
 }
 
-FrameConsole::~FrameConsole()
-{
-}
-
 void FrameConsole::addMessage(PassRefPtrWillBeRawPtr<ConsoleMessage> prpConsoleMessage)
 {
     RefPtrWillBeRawPtr<ConsoleMessage> consoleMessage = prpConsoleMessage;
@@ -155,4 +151,9 @@ void FrameConsole::adoptWorkerConsoleMessages(WorkerGlobalScopeProxy* proxy)
     InspectorInstrumentation::adoptWorkerConsoleMessages(m_frame.document(), proxy);
 }
 
+void FrameConsole::trace(Visitor* visitor)
+{
+    visitor->trace(m_consoleMessageStorage);
+}
+
 } // namespace blink