Add more workarounds for closure compiler in javascript bindings

javascript/olm_pre.js

@@ -2,10 +2,10 @@ var olm_exports = {};
 var get_random_values;
 var process; // Shadow the process object so that emscripten won't get
              // confused by browserify
-if (global && global.window) {
+if (global && global["window"]) {
     // We're running with browserify
     module["exports"] = olm_exports;
-    global.window["Olm"] = olm_exports;
+    global["window"]["Olm"] = olm_exports;
     get_random_values = function(buf) {
         window.crypto.getRandomValues(buf);
     };
@@ -23,7 +23,7 @@ if (global && global.window) {
         var bytes = nodeCrypto.randomBytes(buf.length);
         buf.set(bytes);
     }
-    process = global.process;
+    process = global["process"];
 } else {
     throw new Error("Cannot find global to attach library to");
 }