Omit Referer header when referrer is "no-referrer"

Fixes #323.

Overview.html

@@ -3174,15 +3174,14 @@ <h3 id="http-network-or-cache-fetch"><span class="secno">5.5 </span>HTTP-network
  <var>httpRequest</var>'s
  <a href="#concept-request-header-list" title="concept-request-header-list">header list</a>.
 
- <li><p><a href="#concept-header-list-append" title="concept-header-list-append">Append</a>
- `<code title="">Referer</code>`/empty byte sequence, if <var>httpRequest</var>'s
- <a href="#concept-request-referrer" title="concept-request-referrer">referrer</a> is "<code>no-referrer</code>", and
+ <li><p>If <var>httpRequest</var>'s <a href="#concept-request-referrer" title="concept-request-referrer">referrer</a> is a
+ <a class="external" data-anolis-spec="url" href="https://url.spec.whatwg.org/#concept-url" title="concept-url">URL</a>, then
+ <a href="#concept-header-list-append" title="concept-header-list-append">append</a>
  `<code title="">Referer</code>`/<var>httpRequest</var>'s
  <a href="#concept-request-referrer" title="concept-request-referrer">referrer</a>,
  <a class="external" data-anolis-spec="url" href="https://url.spec.whatwg.org/#concept-url-serializer" title="concept-url-serializer">serialized</a> and
- <a class="external" data-anolis-spec="encoding" href="https://encoding.spec.whatwg.org/#utf-8-encode" title="utf-8 encode">utf-8 encoded</a>, otherwise, to
- <var>httpRequest</var>'s
- <a href="#concept-request-header-list" title="concept-request-header-list">header list</a>.
+ <a class="external" data-anolis-spec="encoding" href="https://encoding.spec.whatwg.org/#utf-8-encode" title="utf-8 encode">utf-8 encoded</a>, to
+ <var>httpRequest</var>'s <a href="#concept-request-header-list" title="concept-request-header-list">header list</a>.
  <!-- XXX ideally we have an easier way to convert something ASCII-safe into bytes
           concept-as-bytes -->
 
@@ -5621,6 +5620,7 @@ <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>
 Jeff Hodges,
 Jeffrey Yasskin,
 Jesse M. Heines,
+Jochen Eisinger,
 Jonas Sicking,
 Jonathan Kingston,
 Jonathan Watt,

Overview.src.html

@@ -3102,15 +3102,14 @@ <h3>HTTP-network-or-cache fetch</h3>
  <var>httpRequest</var>'s
  <span title=concept-request-header-list>header list</span>.
 
- <li><p><span title=concept-header-list-append>Append</span>
- `<code title>Referer</code>`/empty byte sequence, if <var>httpRequest</var>'s
- <span title=concept-request-referrer>referrer</span> is "<code>no-referrer</code>", and
+ <li><p>If <var>httpRequest</var>'s <span title=concept-request-referrer>referrer</span> is a
+ <span data-anolis-spec=url title=concept-url>URL</span>, then
+ <span title=concept-header-list-append>append</span>
  `<code title>Referer</code>`/<var>httpRequest</var>'s
  <span title=concept-request-referrer>referrer</span>,
  <span data-anolis-spec=url title=concept-url-serializer>serialized</span> and
- <span data-anolis-spec=encoding title="utf-8 encode">utf-8 encoded</span>, otherwise, to
- <var>httpRequest</var>'s
- <span title=concept-request-header-list>header list</span>.
+ <span data-anolis-spec=encoding title="utf-8 encode">utf-8 encoded</span>, to
+ <var>httpRequest</var>'s <span title=concept-request-header-list>header list</span>.
  <!-- XXX ideally we have an easier way to convert something ASCII-safe into bytes
           concept-as-bytes -->
 
@@ -5457,6 +5456,7 @@ <h2 class=no-num>Acknowledgments</h2>
 Jeff Hodges,
 Jeffrey Yasskin,
 Jesse M. Heines,
+Jochen Eisinger,
 Jonas Sicking,
 Jonathan Kingston,
 Jonathan Watt,