cc: Fix capitalization style in chromified files.

cc/layers/heads_up_display_layer.cc

Index: cc/layers/heads_up_display_layer.cc
diff --git a/cc/layers/heads_up_display_layer.cc b/cc/layers/heads_up_display_layer.cc
index 51a6bcc1124ebc82adbfab07f4e7cafd744d54b9..f2d46ed7106472e5a1b25dcd5eb74c95d3d4aea0 100644
--- a/cc/layers/heads_up_display_layer.cc
+++ b/cc/layers/heads_up_display_layer.cc
@@ -56,8 +56,8 @@ void HeadsUpDisplayLayer::Update(ResourceUpdateQueue*,
 bool HeadsUpDisplayLayer::DrawsContent() const { return true; }
 
 scoped_ptr<LayerImpl> HeadsUpDisplayLayer::CreateLayerImpl(
-    LayerTreeImpl* treeImpl) {
-  return HeadsUpDisplayLayerImpl::Create(treeImpl, layer_id_).
+    LayerTreeImpl* tree_impl) {
+  return HeadsUpDisplayLayerImpl::Create(tree_impl, layer_id_).
       PassAs<LayerImpl>();
 }