[epiphany] (16 commits) ...ephy.js: Further improve and/or remove misleading error messages

[Jan-Michael Brummer <jbrummer src gnome org>]

Summary of changes:

  9260ec6... ephy.js: Move forms code around (*)
  7591cbc... ephy.js: Simplify expression (*)
  de6ea44... ephy.js: Fix abbreviation (*)
  a5c0416... ephy.js: passwordNode is now required for _findFormAuthElem (*)
  c17988f... web-extension: Print better JS error messages (*)
  654d828... ephy.js: Add _generateFormAuth helper (*)
  627169c... ephy.js: Remove nonsense check (*)
  341edbd... ephy.js: Fix misleading log statement (*)
  35bf612... ephy.js: Move more work into _generateFormAuth (*)
  652046a... js: opt-in to strict mode (*)
  9714735... ephy.js: Use arrow functions (*)
  e9ed23b... ephy.js: Simplify a condition (*)
  4e1f237... ephy.js: no need for FormManager to store a FormAuth member (*)
  5d5a1d7... ephy.js: Don't require input element name for form autofill (*)
  9bb8113... Fix naming issues with password manager username query func (*)
  2cc4706... ephy.js: Further improve and/or remove misleading error mes (*)

(*) This commit already existed in another branch; no separate mail sent