IPC: Restrict 'toplevel' to truly toplevel events.

ipc/ipc_channel_proxy.cc

Index: ipc/ipc_channel_proxy.cc
diff --git a/ipc/ipc_channel_proxy.cc b/ipc/ipc_channel_proxy.cc
index 7c96c83e30c825f140fe842bcb2df55b825b95c5..5c4d743cb3c9b0274cd23c86037c546a0e3c0009 100644
--- a/ipc/ipc_channel_proxy.cc
+++ b/ipc/ipc_channel_proxy.cc
@@ -243,10 +243,10 @@ void ChannelProxy::Context::OnDispatchMessage(const Message& message) {
   Logging* logger = Logging::GetInstance();
   std::string name;
   logger->GetMessageText(message.type(), &name, &message, NULL);
-  TRACE_EVENT1("toplevel", "ChannelProxy::Context::OnDispatchMessage",
+  TRACE_EVENT1("ipc", "ChannelProxy::Context::OnDispatchMessage",
                "name", name);
 #else
-  TRACE_EVENT2("toplevel", "ChannelProxy::Context::OnDispatchMessage",
+  TRACE_EVENT2("ipc", "ChannelProxy::Context::OnDispatchMessage",
                "class", IPC_MESSAGE_ID_CLASS(message.type()),
                "line", IPC_MESSAGE_ID_LINE(message.type()));
 #endif