Revert cl 9528 to fix mac test_shell_tests

net/base/completion_callback.h

Index: net/base/completion_callback.h
===================================================================
--- net/base/completion_callback.h	(revision 9528)
+++ net/base/completion_callback.h	(working copy)
@@ -6,6 +6,7 @@
 #define NET_BASE_COMPLETION_CALLBACK_H__
 
 #include "base/task.h"
+#include "net/base/io_buffer.h"
 
 namespace net {
 
@@ -41,8 +42,23 @@
     is_canceled_ = true;
   }
 
+  // Attaches the given buffer to this callback so it is valid until the
+  // operation completes. TODO(rvargas): This is a temporal fix for bug 5325
+  // while I send IOBuffer to the lower layers of code.
+  void UseBuffer(net::IOBuffer* buffer) {
+    DCHECK(!buffer_.get());
+    buffer_ = buffer;
+  }
+
+  // The callback is not expected anymore so release the buffer.
+  void ReleaseBuffer() {
+    DCHECK(buffer_.get());
+    buffer_ = NULL;
+  }
+
   virtual void RunWithParams(const Tuple1<int>& params) {
     if (is_canceled_) {
+      CancelableCompletionCallback<T>::ReleaseBuffer();
       base::RefCounted<CancelableCompletionCallback<T> >::Release();
     } else {
       CompletionCallbackImpl<T>::RunWithParams(params);
@@ -50,6 +66,7 @@
   }
 
  private:
+  scoped_refptr<net::IOBuffer> buffer_;
   bool is_canceled_;
 };