cc: Make the ScopedPtrVector and ScopedPtrDeque containers act like STL vector and deque.

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index e305b889cc546cabf4f99ad4753b3150560ced2f..d1bee109b27cde0e52dfbe6d15fd396d2f853d93 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -531,7 +531,7 @@ gfx::Size LayerTreeHostImpl::contentSize() const
 {
     // TODO(aelias): Hardcoding the first child here is weird. Think of
     // a cleaner way to get the contentBounds on the Impl side.
-    if (!m_rootScrollLayerImpl || m_rootScrollLayerImpl->children().isEmpty())
+    if (!m_rootScrollLayerImpl || m_rootScrollLayerImpl->children().empty())
         return gfx::Size();
     return m_rootScrollLayerImpl->children()[0]->contentBounds();
 }