Purge the ScrollBlocksOn code.

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 43a424fadba349c34711aa5d2ea98362e90865f7..ec5a60980f21d48bc79f22d3cc623e31f166c06c 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -31,7 +31,6 @@
 #include "cc/layers/layer_position_constraint.h"
 #include "cc/layers/performance_properties.h"
 #include "cc/layers/render_surface_impl.h"
-#include "cc/layers/scroll_blocks_on.h"
 #include "cc/output/filter_operations.h"
 #include "cc/quads/shared_quad_state.h"
 #include "cc/resources/resource_provider.h"
@@ -530,15 +529,9 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
     return touch_event_handler_region_;
   }
 
-  void SetScrollBlocksOn(ScrollBlocksOn scroll_blocks_on) {
-    scroll_blocks_on_ = scroll_blocks_on;
-  }
-  ScrollBlocksOn scroll_blocks_on() const { return scroll_blocks_on_; }
-
   InputHandler::ScrollStatus TryScroll(
       const gfx::PointF& screen_space_point,
-      InputHandler::ScrollInputType type,
-      ScrollBlocksOn effective_block_mode) const;
+      InputHandler::ScrollInputType type) const;
 
   void SetDoubleSided(bool double_sided);
   bool double_sided() const { return double_sided_; }
@@ -776,9 +769,6 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
   bool have_wheel_event_handlers_ : 1;
   bool have_scroll_event_handlers_ : 1;
 
-  static_assert(SCROLL_BLOCKS_ON_MAX < (1 << 3), "ScrollBlocksOn too big");
-  ScrollBlocksOn scroll_blocks_on_ : 3;
-
   bool user_scrollable_horizontal_ : 1;
   bool user_scrollable_vertical_ : 1;
   bool stacking_order_changed_ : 1;