cc: Fix build issues for adding ‘chromium_code’: 1 to cc.gyp and cc_tests.gyp

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 76095dec09b29960437a20f3def8b60219e15fc9..3d975eec08946731fe7701ecd3feddd3d27a5e1c 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1108,7 +1108,7 @@ void LayerTreeHostImpl::Readback(void* pixels,
 }
 
 bool LayerTreeHostImpl::haveRootScrollLayer() const {
-  return RootScrollLayer();
+  return !!RootScrollLayer();
 }
 
 LayerImpl* LayerTreeHostImpl::RootLayer() const {
@@ -1395,7 +1395,7 @@ void LayerTreeHostImpl::setNeedsRedraw() {
 
 bool LayerTreeHostImpl::EnsureRenderSurfaceLayerList() {
   active_tree_->UpdateDrawProperties(LayerTreeImpl::UPDATE_ACTIVE_TREE);
-  return active_tree_->RenderSurfaceLayerList().size();
+  return !active_tree_->RenderSurfaceLayerList().empty();
 }
 
 InputHandlerClient::ScrollStatus LayerTreeHostImpl::ScrollBegin(