[Mac] Log stack trace for CHECK in bug 97285.

content/renderer/plugin_channel_host.h

Index: content/renderer/plugin_channel_host.h
diff --git a/content/renderer/plugin_channel_host.h b/content/renderer/plugin_channel_host.h
index 486098d2432d32942b0f9f352df0c62670178105..68146913af3148405c5bf5125b9f9dabf80b8ef0 100644
--- a/content/renderer/plugin_channel_host.h
+++ b/content/renderer/plugin_channel_host.h
@@ -17,6 +17,11 @@ class NPObjectBase;
 // On the plugin side there's a corresponding PluginChannel.
 class PluginChannelHost : public NPChannelBase {
  public:
+#if defined(OS_MACOSX)
+  // TODO(shess): Debugging for http://crbug.com/97285 .  See comment
+  // in plugin_channel_host.cc.
+  static bool* GetRemoveTrackingFlag();
+#endif
   static PluginChannelHost* GetPluginChannelHost(
       const IPC::ChannelHandle& channel_handle,
       base::MessageLoopProxy* ipc_message_loop);