[cssom] U+007F should still be escaped in serialization, oops. Fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=25500

Author: Simon Pieters

cssom/Overview.html

@@ -328,7 +328,7 @@ <h3 id="common-serializing-idioms"><span class="secno">3.1 </span>Common Seriali
 <ul>
  <li>If the character is NULL (U+0000), then <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#concept-throw" title="concept-throw">throw</a> an
  <code class="external" data-anolis-spec="dom"><a href="http://dom.spec.whatwg.org/#invalidcharactererror">InvalidCharacterError</a></code> exception and terminate these steps.</li>
- <li>If the character is in the range [\1-\1f] (U+0001 to U+001F), then the character
+ <li>If the character is in the range [\1-\1f] (U+0001 to U+001F) or is U+007F, then the character
  <a href="#escape-a-character-as-code-point" title="escape a character as code point">escaped as code point</a>.</li>
  <li>If the character is the first character and is in the range [0-9]
  (U+0030 to U+0039), then the character
@@ -354,7 +354,7 @@ <h3 id="common-serializing-idioms"><span class="secno">3.1 </span>Common Seriali
 <ul>
  <li>If the character is NULL (U+0000), then <a class="external" data-anolis-spec="dom" href="http://dom.spec.whatwg.org/#concept-throw" title="concept-throw">throw</a> an
  <code class="external" data-anolis-spec="dom"><a href="http://dom.spec.whatwg.org/#invalidcharactererror">InvalidCharacterError</a></code> exception and terminate these steps.</li>
- <li>If the character is in the range [\1-\1f] (U+0001 to U+001F), the character
+ <li>If the character is in the range [\1-\1f] (U+0001 to U+001F) or is U+007F, the character
  <a href="#escape-a-character-as-code-point" title="escape a character as code point">escaped as code point</a>.</li>
  <li>If the character is '"' (U+0022) or "<code title="">\</code>"
  (U+005C), the <a href="#escape-a-character" title="escape a character">escaped</a> character.</li>

cssom/Overview.src.html

@@ -245,7 +245,7 @@ <h3>Common Serializing Idioms</h3>
 <ul>
  <li>If the character is NULL (U+0000), then <span data-anolis-spec=dom title=concept-throw>throw</span> an
  <code data-anolis-spec=dom>InvalidCharacterError</code> exception and terminate these steps.</li>
- <li>If the character is in the range [\1-\1f] (U+0001 to U+001F), then the character
+ <li>If the character is in the range [\1-\1f] (U+0001 to U+001F) or is U+007F, then the character
  <span title="escape a character as code point">escaped as code point</span>.</li>
  <li>If the character is the first character and is in the range [0-9]
  (U+0030 to U+0039), then the character
@@ -271,7 +271,7 @@ <h3>Common Serializing Idioms</h3>
 <ul>
  <li>If the character is NULL (U+0000), then <span data-anolis-spec=dom title=concept-throw>throw</span> an
  <code data-anolis-spec=dom>InvalidCharacterError</code> exception and terminate these steps.</li>
- <li>If the character is in the range [\1-\1f] (U+0001 to U+001F), the character
+ <li>If the character is in the range [\1-\1f] (U+0001 to U+001F) or is U+007F, the character
  <span title="escape a character as code point">escaped as code point</span>.</li>
  <li>If the character is '"' (U+0022) or "<code title>\</code>"
  (U+005C), the <span title="escape a character">escaped</span> character.</li>