Fix base::internal::WeakReferenceOwner races.

base/memory/weak_ptr_unittest.cc

Index: base/memory/weak_ptr_unittest.cc
diff --git a/base/memory/weak_ptr_unittest.cc b/base/memory/weak_ptr_unittest.cc
index 6c2a7e8dcbc5eb9e8c5091cae3848b76063555da..55f7428c92e769cc54ea665ea56c42cc31443032 100644
--- a/base/memory/weak_ptr_unittest.cc
+++ b/base/memory/weak_ptr_unittest.cc
@@ -6,6 +6,7 @@
 #include "base/memory/weak_ptr.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "base/message_loop.h"
+#include "base/task.h"
 #include "base/threading/thread.h"
 
 namespace base {
@@ -38,8 +39,6 @@ struct Derived : Base {};
 struct Producer : SupportsWeakPtr<Producer> {};
 struct Consumer { WeakPtr<Producer> producer; };
 
-}  // namespace
-
 TEST(WeakPtrTest, Basic) {
   int data;
   WeakPtrFactory<int> factory(&data);
@@ -134,4 +133,20 @@ TEST(WeakPtrTest, SingleThreaded2) {
   EXPECT_EQ(&producer, consumer->producer.get());
 }
 
+TEST(WeakPtrTest, DeleteWeakPtrOnDifferentThread) {
+  Producer producer;
+  {
+    WeakPtr<Producer>* ptr = new WeakPtr<Producer>(producer.AsWeakPtr());
+    Thread thread("I delete WeakPtrs, w00t!");
+    thread.Start();
+    thread.message_loop()->PostTask(FROM_HERE,
+                                    new DeleteTask<WeakPtr<Producer> >(ptr));
+    // |thread| will be joined on destruction.
+  }
+  WeakPtr<Producer> weak_ptr = producer.AsWeakPtr();
+  EXPECT_TRUE(weak_ptr.get() != NULL);
+}
+
+}  // namespace
+
 }  // namespace base