Clean up potentially leaky use of base::DeletePointer.

base/bind_helpers.h

Index: base/bind_helpers.h
diff --git a/base/bind_helpers.h b/base/bind_helpers.h
index c49b5b8187ae3757207b701f648efe383fa3e29a..0c96eea65e0fd01aa75dad2dbf3baeeaf6fe312e 100644
--- a/base/bind_helpers.h
+++ b/base/bind_helpers.h
@@ -145,6 +145,7 @@
 
 #include "base/basictypes.h"
 #include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/template_util.h"
 
@@ -593,8 +594,8 @@ IgnoreResult(const Callback<T>& data) {
 BASE_EXPORT void DoNothing();
 
 template<typename T>
-void DeletePointer(T* obj) {
-  delete obj;
+void DeletePointer(scoped_ptr<T> obj) {
+  // No need to do anything, scoped_ptr<> will do it for us.
 }
 
 }  // namespace base