cc: Remove redundant is_overlay arguments

cc/quads/io_surface_draw_quad.h

Index: cc/quads/io_surface_draw_quad.h
diff --git a/cc/quads/io_surface_draw_quad.h b/cc/quads/io_surface_draw_quad.h
index 0374aa9ed1d60ca5968e3a6233d2989ca4c3414a..4a8a072c61cd75623e0aaec3c7e6c7915d7d869d 100644
--- a/cc/quads/io_surface_draw_quad.h
+++ b/cc/quads/io_surface_draw_quad.h
@@ -28,8 +28,7 @@ class CC_EXPORT IOSurfaceDrawQuad : public DrawQuad {
               const gfx::Rect& visible_rect,
               const gfx::Size& io_surface_size,
               unsigned io_surface_resource_id,
-              Orientation orientation,
-              bool allow_overlay);
+              Orientation orientation);
 
   void SetAll(const SharedQuadState* shared_quad_state,
               const gfx::Rect& rect,
@@ -38,12 +37,10 @@ class CC_EXPORT IOSurfaceDrawQuad : public DrawQuad {
               bool needs_blending,
               const gfx::Size& io_surface_size,
               unsigned io_surface_resource_id,
-              Orientation orientation,
-              bool allow_overlay);
+              Orientation orientation);
 
   gfx::Size io_surface_size;
   Orientation orientation;
-  bool allow_overlay;
 
   ResourceId io_surface_resource_id() const {
     return resources.ids[kIOSurfaceResourceIdIndex];