Add wrapper container for a vector of OwnPtr<T>

cc/CCLayerImplTest.cpp

Index: cc/CCLayerImplTest.cpp
diff --git a/cc/CCLayerImplTest.cpp b/cc/CCLayerImplTest.cpp
index 425775e4622d36c9905e6597a892bb60a5984200..1115ec0623932553f632a301339a687fb8773485 100644
--- a/cc/CCLayerImplTest.cpp
+++ b/cc/CCLayerImplTest.cpp
@@ -62,9 +62,9 @@ TEST(CCLayerImplTest, verifyLayerChangesAreTrackedProperly)
     // Create a simple CCLayerImpl tree:
     OwnPtr<CCLayerImpl> root = CCLayerImpl::create(1);
     root->addChild(CCLayerImpl::create(2));
-    CCLayerImpl* child = root->children()[0].get();
+    CCLayerImpl* child = root->children()[0];
     child->addChild(CCLayerImpl::create(3));
-    CCLayerImpl* grandChild = child->children()[0].get();
+    CCLayerImpl* grandChild = child->children()[0];
 
     // Adding children is an internal operation and should not mark layers as changed.
     EXPECT_FALSE(root->layerPropertyChanged());