WebApps: unity-chromium-extensions

Merge proposals dependent on lp://staging/~abreu-alexandre/unity-chromium-extension/12-10.fix-1139711

  1. 12-10.fix-1139711
  2. Dependent merge proposals

lp://staging/~abreu-alexandre/unity-chromium-extension/12-10.fix-1139711 has no merge proposals.