cc: Remove unused proto conversion code.

cc/layers/solid_color_scrollbar_layer.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_
 #define CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_
 
 #include "base/macros.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
@@ skipping 11 matching lines @@
       int thumb_thickness,
       int track_start,
       bool is_left_side_vertical_scrollbar,
       int scroll_layer_id);
 
   // Layer overrides.
   bool OpacityCanAnimateOnImplThread() const override;
   bool AlwaysUseActiveTreeOpacity() const override;
   ScrollbarLayerInterface* ToScrollbarLayer() override;
   void ToLayerNodeProto(proto::LayerNode* proto) const override;
-  void FromLayerNodeProto(const proto::LayerNode& proto,
-                          const LayerIdMap& layer_map,
-                          LayerTreeHost* layer_tree_host) override;
 
   void SetOpacity(float opacity) override;
   void PushPropertiesTo(LayerImpl* layer) override;
 
   void SetNeedsDisplayRect(const gfx::Rect& rect) override;
 
   // ScrollbarLayerInterface
   int ScrollLayerId() const override;
   void SetScrollLayer(int layer_id) override;
 
   ScrollbarOrientation orientation() const override;
 
+  int thumb_thickness() const {
+    return solid_color_scrollbar_layer_inputs_.thumb_thickness;
+  }
+
+  int track_start() const {
+    return solid_color_scrollbar_layer_inputs_.track_start;
+  }
+
+  bool is_left_side_vertical_scrollbar() const {
+    return solid_color_scrollbar_layer_inputs_.is_left_side_vertical_scrollbar;
+  }
+
  protected:
   SolidColorScrollbarLayer(ScrollbarOrientation orientation,
                            int thumb_thickness,
                            int track_start,
                            bool is_left_side_vertical_scrollbar,
                            int scroll_layer_id);
   ~SolidColorScrollbarLayer() override;
 
   // Layer overrides for proto conversions.
   void SetTypeForProtoSerialization(proto::LayerNode* proto) const override;
@@ skipping 18 matching lines @@
   };
 
   SolidColorScrollbarLayerInputs solid_color_scrollbar_layer_inputs_;
 
   DISALLOW_COPY_AND_ASSIGN(SolidColorScrollbarLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_