At https://bugs.chromium.org/p/chromium/issues/detail?id=608016 lots of users are raising bug reports on Chrome after they removed the backspace-to-navigate-backwards functionality, so much so that they've relented somewhat and published an official extension to restore this capability. https://goo.gl/L30YZ7"Feel free to point other people at this." they say, well feel free to revert your hasty "fix".