Close #84

Actually <img> elements in <noscript> are not prefetched anymore.

Probably because html5ever already parses the <noscript> content as raw
text data if `scripting_enabled` is activated.

See
https://github.com/servo/html5ever/blob/servo/src/tree_builder/rules.rs#
L126

Also, added a test to the images cache.
Remove VoidVal.

There are no undefined constants in IDL.
Call waitForExplicitFinish in test_img_width_height.html.

This fixes an intermittent failure introduced in
<https://github.com/servo/servo/pull/3929>.
auto merge of #3943 : Ms2ger/servo/img_width_height, r=jdm

This fixes an intermittent failure introduced in
<https://github.com/servo/servo/pull/3929>.
auto merge of #3942 : Ms2ger/servo/VoidVal, r=jdm

There are no undefined constants in IDL.
Remove tests/content/test_document_adoptNode.html.

It is already covered by:

  dom/nodes/Document-adoptNode.html
Remove tests/content/test_document_compatMode.html.

It is already covered by:

  html/dom/documents/resource-metadata-management/document-compatmode-03.html
  dom/nodes/Document-constructor.html
  dom/nodes/DOMImplementation-createHTMLDocument.html
auto merge of #3945 : Ms2ger/servo/rm-tests, r=Manishearth
embedding: begin cef string_map api

cef_string_map_alloc()
embedding: cef_string_map_size()
embedding: cef_string_map_append()
embedding: cef_string_map_find()
embedding: cef_string_map_key()
embedding: cef_string_map_value()
embedding: cef_string_map_clear()
embedding: cef_string_map_free()
embedding: rename string_list internal function to string_list instead of string_map
embedding: cef_string_utf8_cmp()
Bug #3811 - Extracted the script task handlers into methods
auto merge of #3915 : shinglyu/servo/bug3811, r=jdm

This is a fix for bug #3811 , thank you.