Chrome "unofficially" dropped support for pre-3.16 kernels, such as the kernel in Ubuntu 14.04 LTS, about half a year ago. More precisely, they introduced a bug that caused installing extensions to fail with that kernel, and then declined to fix it.
See comment #47: "Ok, while it sounds like this is technically a regression, I'm going to mark this as Wontfix because there is a reasonable workaround of updating your kernel."
https://code.google.com/p/chromium/issues/detail?id=401655
See comment #47: "Ok, while it sounds like this is technically a regression, I'm going to mark this as Wontfix because there is a reasonable workaround of updating your kernel."