Make base::WeakPtr moveable.

base/memory/weak_ptr_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/weak_ptr.h"
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 185 matching lines @@
 }
 
 TEST(WeakPtrFactoryTest, Comparison) {
   int data;
   WeakPtrFactory<int> factory(&data);
   WeakPtr<int> ptr = factory.GetWeakPtr();
   WeakPtr<int> ptr2 = ptr;
   EXPECT_EQ(ptr.get(), ptr2.get());
 }
 
+TEST(WeakPtrFactoryTest, Move) {
+  int data;
+  WeakPtrFactory<int> factory(&data);
+  WeakPtr<int> ptr = factory.GetWeakPtr();
+  WeakPtr<int> ptr2 = factory.GetWeakPtr();
+  WeakPtr<int> ptr3 = std::move(ptr2);
+  EXPECT_NE(ptr.get(), ptr2.get());
+  EXPECT_EQ(ptr.get(), ptr3.get());
+}
+
 TEST(WeakPtrFactoryTest, OutOfScope) {
   WeakPtr<int> ptr;
   EXPECT_EQ(nullptr, ptr.get());
   {
     int data;
     WeakPtrFactory<int> factory(&data);
     ptr = factory.GetWeakPtr();
   }
   EXPECT_EQ(nullptr, ptr.get());
 }
@@ skipping 446 matching lines @@
   background.Start();
   background.DeleteTarget(target.release());
 
   // Main thread attempts to dereference the target, violating thread binding.
   ASSERT_DEATH(arrow.target.get(), "");
 }
 
 #endif
 
 }  // namespace base