Fix the GCC build.

base/message_loop.cc

Index: base/message_loop.cc
===================================================================
--- base/message_loop.cc	(revision 1959)
+++ base/message_loop.cc	(working copy)
@@ -337,9 +337,9 @@
   }
   did_work |= !deferred_non_nestable_work_queue_.empty();
   while (!deferred_non_nestable_work_queue_.empty()) {
-    Task* task = deferred_non_nestable_work_queue_.front().task;
+    // TODO(darin): Delete all tasks once it is safe to do so.
+    //Task* task = deferred_non_nestable_work_queue_.front().task;
     deferred_non_nestable_work_queue_.pop();
-    // TODO(darin): Delete all tasks once it is safe to do so.
     //delete task;
   }
   did_work |= !delayed_work_queue_.empty();