Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/inspector/InspectorInspectorAgent.cpp

Index: Source/core/inspector/InspectorInspectorAgent.cpp
diff --git a/Source/core/inspector/InspectorInspectorAgent.cpp b/Source/core/inspector/InspectorInspectorAgent.cpp
index 95fc1077cbfaeb98bf45d7c860281d3d7be9c907..2717a6ef76b58b32a7ceacfc1cfd5ecf50c90a35 100644
--- a/Source/core/inspector/InspectorInspectorAgent.cpp
+++ b/Source/core/inspector/InspectorInspectorAgent.cpp
@@ -158,8 +158,8 @@ void InspectorInspectorAgent::inspect(PassRefPtr<TypeBuilder::Runtime::RemoteObj
 {
     if (m_state->getBoolean(InspectorAgentState::inspectorAgentEnabled) && m_frontend) {
         m_frontend->inspector()->inspect(objectToInspect, hints);
-        m_pendingInspectData.first = 0;
-        m_pendingInspectData.second = 0;
+        m_pendingInspectData.first = nullptr;
+        m_pendingInspectData.second = nullptr;
         return;
     }
     m_pendingInspectData.first = objectToInspect;