Remove some of the instrumentation plumbing

cc/resources/zero_copy_raster_worker_pool.cc

Index: cc/resources/zero_copy_raster_worker_pool.cc
diff --git a/cc/resources/zero_copy_raster_worker_pool.cc b/cc/resources/zero_copy_raster_worker_pool.cc
index 4030942605e20699e04addc02c6096fae95ae843..40c787fd8aa96dcf8738caaa43e1c1af552e1801 100644
--- a/cc/resources/zero_copy_raster_worker_pool.cc
+++ b/cc/resources/zero_copy_raster_worker_pool.cc
@@ -26,8 +26,7 @@ class RasterBufferImpl : public RasterBuffer {
   // Overridden from RasterBuffer:
   void Playback(const RasterSource* raster_source,
                 const gfx::Rect& rect,
-                float scale,
-                RenderingStatsInstrumentation* stats) override {
+                float scale) override {
     gfx::GpuMemoryBuffer* gpu_memory_buffer = lock_.GetGpuMemoryBuffer();
     if (!gpu_memory_buffer)
       return;
@@ -38,8 +37,7 @@ class RasterBufferImpl : public RasterBuffer {
                                        gpu_memory_buffer->GetStride(),
                                        raster_source,
                                        rect,
-                                       scale,
-                                       stats);
+                                       scale);
     gpu_memory_buffer->Unmap();
   }