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This is an attempt to bring Chrome's cookie behavior in line with the
majority of other major UAs, and thus are de facto standards. The
specific updates are:
  1. An empty domain attribute value should be ignored as a
     non-attribute rather than setting an empty attribute value.
  2. An empty cookie line (or a cookie line with ignored characters)
     should be treated as setting an empty value for the empty-key.

BUG=601786

Review-Url: https://codereview.chromium.org/2246613003
Cr-Commit-Position: refs/heads/master@{#412608}