* sh-headless-chrome-support: (167 commits)
  use resize_window helper
  refactor wait_for_requests, add slow_requests block helper
  target label instead of obscured input element
  scroll to top before attempting to click the "Side-by-side" button
  remove out-of-date comments about webdriver compatability
  explicitly add Accept: */* HTTP header back to test
  add visible argument to helper rather than duplicating code
  add InspectRequests helper automatically to :js tests
  add CookieHelper and InputHelper automatically to :js tests
  fix bracket styling
  remove unused capybara_select2 helper
  add spacing around yield
  add slow_requests! to filtered search tests which expect to see a loading spinner
  make window resizing more resiliant on small screens when headless mode is off
  fix flaky fill_in use in which return key would occasionally be intercepted by autocomplete
  move resize option the pre-test hooks instead of post-test
  enable CHROME_HEADLESS environment variable for Spinach tests similar to RSpec
  reset browser window size between tests
  explicitly check innerText since selenium webdriver only looks at visible text
  prevent resolve buttons from being clicked twice triggering a race condition
  ...