Oilpan: fix build after r195134.

Source/core/inspector/PerIsolateDebuggerClient.cpp

Index: Source/core/inspector/PerIsolateDebuggerClient.cpp
diff --git a/Source/core/inspector/PerIsolateDebuggerClient.cpp b/Source/core/inspector/PerIsolateDebuggerClient.cpp
index b87fb8286ac8cc0b77952ddf192d6a9330e8b7f1..7628b299cab9ce4c78d4be08588caf006bef8610 100644
--- a/Source/core/inspector/PerIsolateDebuggerClient.cpp
+++ b/Source/core/inspector/PerIsolateDebuggerClient.cpp
@@ -12,7 +12,7 @@
 
 namespace blink {
 
-PerIsolateDebuggerClient::PerIsolateDebuggerClient(v8::Isolate* isolate, PassOwnPtr<ScriptDebugServer> scriptDebugServer)
+PerIsolateDebuggerClient::PerIsolateDebuggerClient(v8::Isolate* isolate, PassOwnPtrWillBeRawPtr<ScriptDebugServer> scriptDebugServer)
     : m_isolate(isolate)
     , m_scriptDebugServer(scriptDebugServer)
 {
@@ -22,6 +22,12 @@ PerIsolateDebuggerClient::~PerIsolateDebuggerClient()
 {
 }
 
+DEFINE_TRACE(PerIsolateDebuggerClient)
+{
+    visitor->trace(m_scriptDebugServer);
+    ScriptDebugServer::Client::trace(visitor);
+}
+
 v8::Local<v8::Object> PerIsolateDebuggerClient::compileDebuggerScript()
 {
     const WebData& debuggerScriptSourceResource = Platform::current()->loadResource("DebuggerScriptSource.js");