Remove the injected script after being executed

Fix #63.

Author: zalmoxisus

src/browser/extension/inject/pageScriptWrap.js

@@ -1,14 +1,15 @@
 let s = document.createElement('script');
+s.type = 'text/javascript';
 
 if (process.env.NODE_ENV === 'production') {
   const script = require('raw!tmp/page.bundle.js');
   s.appendChild(document.createTextNode(script));
+  (document.head || document.documentElement).appendChild(s);
+  s.parentNode.removeChild(s);
 } else {
   s.src = chrome.extension.getURL('js/page.bundle.js');
+  s.onload = function() {
+    this.parentNode.removeChild(this);
+  };
+  (document.head || document.documentElement).appendChild(s);
 }
-
-s.type = 'text/javascript';
-s.onload = function() {
-  this.parentNode.removeChild(this);
-};
-(document.head || document.documentElement).appendChild(s);

src/browser/extension/options/syncOptions.js

@@ -46,10 +46,8 @@ const injectOptions = newOptions => {
   let s = document.createElement('script');
   s.type = 'text/javascript';
   s.appendChild(document.createTextNode('window.devToolsOptions=' + JSON.stringify(options)));
-  s.onload = function() {
-    this.parentNode.removeChild(this);
-  };
   (document.head || document.documentElement).appendChild(s);
+  s.parentNode.removeChild(s);
 };
 
 export const getOptionsFromBg = () => {