Add back missing tab context properties

These properties, used to detect/act on/report
unencrypted connection, were erroneously removed
when importing uBO's code en-bloc.

Related issue:
- https://github.com/uBlockOrigin/uMatrix-issues/issues/212

src/js/tab.js

@@ -180,9 +180,11 @@ housekeep itself.
         this.stack = [];
         this.rawURL =
         this.normalURL =
+        this.scheme =
         this.origin =
         this.rootHostname =
         this.rootDomain = '';
+        this.secure = false;
         this.commitTimer = null;
         this.gcTimer = null;
         this.onGCBarrier = false;
@@ -266,19 +268,23 @@ housekeep itself.
         if ( this.stack.length === 0 ) {
             this.rawURL =
             this.normalURL =
+            this.scheme =
             this.origin =
             this.rootHostname =
             this.rootDomain = '';
+            this.secure = false;
             return;
         }
         const stackEntry = this.stack[this.stack.length - 1];
         this.rawURL = stackEntry.url;
         this.normalURL = µm.normalizePageURL(this.tabId, this.rawURL);
+        this.scheme = µm.URI.schemeFromURI(this.rawURL);
         this.origin = µm.URI.originFromURI(this.normalURL);
         this.rootHostname = µm.URI.hostnameFromURI(this.origin);
         this.rootDomain =
             µm.URI.domainFromHostname(this.rootHostname) ||
             this.rootHostname;
+         this.secure = µm.URI.isSecureScheme(this.scheme);
     };
 
     // Called whenever a candidate root URL is spotted for the tab.

src/js/uritools.js

@@ -31,7 +31,7 @@ Naming convention from https://en.wikipedia.org/wiki/URI_scheme#Examples
 
 /******************************************************************************/
 
-µMatrix.URI = (function() {
+µMatrix.URI = (( ) => {
 
 /******************************************************************************/
 
@@ -70,7 +70,7 @@ const reHostFromNakedAuthority = /^[0-9a-z._-]+[0-9a-z]$/i;
 
 /******************************************************************************/
 
-var reset = function(o) {
+const reset = function(o) {
     o.scheme = '';
     o.hostname = '';
     o._ipv4 = undefined;
@@ -82,7 +82,7 @@ var reset = function(o) {
     return o;
 };
 
-var resetAuthority = function(o) {
+const resetAuthority = function(o) {
     o.hostname = '';
     o._ipv4 = undefined;
     o._ipv6 = undefined;
@@ -240,12 +240,12 @@ URI.isNetworkScheme = function(scheme) {
 
 /******************************************************************************/
 
+const reSecureScheme = /^(?:http|ws|ftp)s\b/;
+
 URI.isSecureScheme = function(scheme) {
-    return this.reSecureScheme.test(scheme);
+    return reSecureScheme.test(scheme);
 };
 
-URI.reSecureScheme = /^(?:https|wss|ftps)\b/;
-
 /******************************************************************************/
 
 URI.hostnameFromURI = vAPI.hostnameFromURI;