https://cs.chromium.org/chromium/src/content/browser/renderer_host/render_widget_host_view_mac_editcommand_helper.mm?sq=package:chromium

Each RenderWidgetHostViewMacEditCommandHelper creates a base::hash_set edit_command_set_. This hash_set contains ~90 strings. Its exactly the same for each RenderWidgetHostViewMacEditCommandHelper, and each WebContentsView creates a RenderWidgetHostViewMacEditCommandHelper. This wasted ~240KB of memory for my ~30 tab browser.

"""
RenderWidgetHostViewMacEditCommandHelper::
    RenderWidgetHostViewMacEditCommandHelper() {
  for (size_t i = 0; i < arraysize(kEditCommands); ++i) {
    edit_command_set_.insert(kEditCommands[i]);
  }
}
"""