cc: Remove all blimp code from cc.

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index 88c7002fd502a58cd8c5d6aa3cb499800bc26230..3302a86d8f12f1fae59983e4d7107493a3d9effd 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -20,10 +20,6 @@
 
 namespace cc {
 
-namespace proto {
-class LayerTreeSettings;
-}  // namespace proto
-
 class CC_EXPORT LayerTreeSettings {
  public:
   LayerTreeSettings();
@@ -32,9 +28,6 @@ class CC_EXPORT LayerTreeSettings {
 
   bool operator==(const LayerTreeSettings& other) const;
 
-  void ToProtobuf(proto::LayerTreeSettings* proto) const;
-  void FromProtobuf(const proto::LayerTreeSettings& proto);
-
   SchedulerSettings ToSchedulerSettings() const;
 
   RendererSettings renderer_settings;