Revert workaround due to perf regression

content/browser/gpu/gpu_data_manager_impl_private.cc

Index: content/browser/gpu/gpu_data_manager_impl_private.cc
diff --git a/content/browser/gpu/gpu_data_manager_impl_private.cc b/content/browser/gpu/gpu_data_manager_impl_private.cc
index 0414f6c311072b1baa3d6ae9176e1ab0f6c7f3d4..0f517cefa2636c29e7e8cf4da2fdd94d696f26ad 100644
--- a/content/browser/gpu/gpu_data_manager_impl_private.cc
+++ b/content/browser/gpu/gpu_data_manager_impl_private.cc
@@ -877,8 +877,6 @@ void GpuDataManagerImplPrivate::UpdateRendererWebPrefs(
   prefs->disable_2d_canvas_copy_on_write =
       IsDriverBugWorkaroundActive(gpu::BROKEN_EGL_IMAGE_REF_COUNTING) &&
       command_line->HasSwitch(switches::kEnableThreadedTextureMailboxes);
-  prefs->force_software_readback_from_2d_canvas =
-      IsDriverBugWorkaroundActive(gpu::FORCE_SOFTWARE_READBACK_FROM_2D_CANVAS);
 }
 
 void GpuDataManagerImplPrivate::DisableHardwareAcceleration() {