CB-4858 Convert relative URLs to absolute URLs in JS

www/InAppBrowser.js

@@ -22,6 +22,7 @@
 var exec = require('cordova/exec');
 var channel = require('cordova/channel');
 var modulemapper = require('cordova/modulemapper');
+var urlutil = require('cordova/urlutil');
 
 function InAppBrowser() {
    this.channels = {
@@ -81,17 +82,18 @@ InAppBrowser.prototype = {
 };
 
 module.exports = function(strUrl, strWindowName, strWindowFeatures) {
-    var iab = new InAppBrowser();
-    var cb = function(eventname) {
-       iab._eventHandler(eventname);
-    };
-
     // Don't catch calls that write to existing frames (e.g. named iframes).
     if (window.frames && window.frames[strWindowName]) {
         var origOpenFunc = modulemapper.getOriginalSymbol(window, 'open');
         return origOpenFunc.apply(window, arguments);
     }
 
+    strUrl = urlutil.makeAbsolute(strUrl);
+    var iab = new InAppBrowser();
+    var cb = function(eventname) {
+       iab._eventHandler(eventname);
+    };
+
     exec(cb, cb, "InAppBrowser", "open", [strUrl, strWindowName, strWindowFeatures]);
     return iab;
 };