cc: Remove cheapness estimator usage from tile manager.

cc/resources/picture_pile_impl.cc

Index: cc/resources/picture_pile_impl.cc
diff --git a/cc/resources/picture_pile_impl.cc b/cc/resources/picture_pile_impl.cc
index 7db0ecfccfe79224a740f58148ce791300ca35c7..865e878ac75a1d1894775a3435937c69bd6164ff 100644
--- a/cc/resources/picture_pile_impl.cc
+++ b/cc/resources/picture_pile_impl.cc
@@ -263,7 +263,6 @@ void PicturePileImpl::AnalyzeInRect(gfx::Rect content_rect,
 
   analysis->is_transparent = canvas.isTransparent();
   analysis->is_solid_color = canvas.getColorIfSolid(&analysis->solid_color);
-  analysis->is_cheap_to_raster = canvas.isCheap();
   analysis->has_text = canvas.hasText();
   canvas.consumeLazyPixelRefs(&analysis->lazy_pixel_refs);
 }
@@ -271,8 +270,7 @@ void PicturePileImpl::AnalyzeInRect(gfx::Rect content_rect,
 PicturePileImpl::Analysis::Analysis()
   : is_solid_color(false),
     is_transparent(false),
-    has_text(false),
-    is_cheap_to_raster(false) {
+    has_text(false) {
 }
 
 PicturePileImpl::Analysis::~Analysis() {