Issue 242 - Use user style sheets on Chromium

include.preload.js

Index: include.preload.js
===================================================================
--- a/include.preload.js
+++ b/include.preload.js
@@ -340,16 +340,17 @@
 };
 
 function ElemHide()
 {
   this.shadow = this.createShadowTree();
   this.styles = new Map();
   this.tracer = null;
   this.inline = true;
+  this.inlineEmulated = true;
   this.emulatedPatterns = null;
 
   this.elemHideEmulation = new ElemHideEmulation(
     this.addSelectors.bind(this),
     this.hideElements.bind(this)
   );
 }
 ElemHide.prototype = {
@@ -448,17 +449,17 @@
       ).join(", ");
       style.sheet.insertRule(selector + "{display: none !important;}",
                              style.sheet.cssRules.length);
     }
   },
 
   addSelectors(selectors, filters)
   {
-    if (this.inline)
+    if (this.inline || this.inlineEmulated)
     {
       // Insert the style rules inline if we have been instructed by the
       // background page to do so. This is usually the case, except on platforms
       // that do support user stylesheets via the browser.tabs.insertCSS API
       // (Firefox 53 onwards for now and possibly Chrome in the near future).
       // Once all supported platforms have implemented this API, we can remove
       // the code below. See issue #5090.
       // Related Chrome and Firefox issues:
@@ -501,16 +502,17 @@
       if (this.tracer)
         this.tracer.disconnect();
       this.tracer = null;
 
       if (response.trace)
         this.tracer = new ElementHidingTracer();
 
       this.inline = response.inline;
+      this.inlineEmulated = !!response.inlineEmulated;
 
       if (this.inline)
         this.addSelectorsInline(response.selectors, "standard");
 
       if (this.tracer)
         this.tracer.addSelectors(response.selectors);
 
       this.elemHideEmulation.apply(response.emulatedPatterns);