Revert of cc: Use worker context for one-copy tile initialization.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index aec0e5dc85bc84a03b3f9f0b8514aa9c83c45629..942470b580592b7a038a6335420b56b0a19f6de9 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -467,11 +467,6 @@
     settings.use_external_begin_frame_source = false;
   }
 
-  settings.max_staging_buffers = 32;
-  // Use 1/4th of staging buffers on low-end devices.
-  if (base::SysInfo::IsLowEndDevice())
-    settings.max_staging_buffers /= 4;
-
   scoped_refptr<base::SingleThreadTaskRunner> compositor_thread_task_runner =
       compositor_deps_->GetCompositorImplThreadTaskRunner();
   scoped_refptr<base::SingleThreadTaskRunner>