Eliminate implicit conversion from scoped_refptr<T> to T*

webkit/plugins/npapi/plugin_instance.h

Index: webkit/plugins/npapi/plugin_instance.h
diff --git a/webkit/plugins/npapi/plugin_instance.h b/webkit/plugins/npapi/plugin_instance.h
index 486e8d220de6f6b76f5cfc1d2c1c4d88bd42b057..04cf6d1c69f6acae5e4cc711803c47d5e0443fde 100644
--- a/webkit/plugins/npapi/plugin_instance.h
+++ b/webkit/plugins/npapi/plugin_instance.h
@@ -23,6 +23,7 @@
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
+#include "webkit/plugins/npapi/plugin_lib.h"
 
 class MessageLoop;
 
@@ -102,7 +103,7 @@ class PluginInstance : public base::RefCountedThreadSafe<PluginInstance> {
   // Get the mimeType for this plugin stream
   const std::string &mime_type() { return mime_type_; }
 
-  PluginLib* plugin_lib() { return plugin_; }
+  scoped_refptr<PluginLib> plugin_lib() { return plugin_; }
 
 #if defined(OS_MACOSX)
   // Get/Set the Mac NPAPI drawing and event models
@@ -139,7 +140,7 @@ class PluginInstance : public base::RefCountedThreadSafe<PluginInstance> {
 
   // This is called when a stream is closed. We remove the stream from the
   // list, which releases the reference maintained to the stream.
-  void RemoveStream(PluginStream* stream);
+  void RemoveStream(scoped_refptr<PluginStream> stream);
 
   // Closes all open streams on this instance.
   void CloseStreams();