cc: Remove OverdrawMetrics and --trace-overdraw flag.

cc/layers/nine_patch_layer_unittest.cc

Index: cc/layers/nine_patch_layer_unittest.cc
diff --git a/cc/layers/nine_patch_layer_unittest.cc b/cc/layers/nine_patch_layer_unittest.cc
index 94e75ebba8452d9f5ed7f3bbb391bba00d0ddd7f..1f93b4c19e3204cef59945883bc9ddfd9f427542 100644
--- a/cc/layers/nine_patch_layer_unittest.cc
+++ b/cc/layers/nine_patch_layer_unittest.cc
@@ -4,7 +4,6 @@
 
 #include "cc/layers/nine_patch_layer.h"
 
-#include "cc/debug/overdraw_metrics.h"
 #include "cc/resources/prioritized_resource_manager.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/resources/resource_update_queue.h"
@@ -57,7 +56,8 @@ TEST_F(NinePatchLayerTest, SetLayerProperties) {
   EXPECT_EQ(test_layer->layer_tree_host(), layer_tree_host_.get());
 
   ResourceUpdateQueue queue;
-  OcclusionTracker<Layer> occlusion_tracker(gfx::Rect(), false);
+  gfx::Rect screen_space_clip_rect;
+  OcclusionTracker<Layer> occlusion_tracker(screen_space_clip_rect);
   test_layer->SavePaintProperties();
   test_layer->Update(&queue, &occlusion_tracker);