Fix content management

Author: helin24

flutter-idea/src/io/flutter/view/EmbeddedBrowser.java

@@ -102,22 +102,13 @@ public void openPanel(ContentManager contentManager, String tabName, DevToolsUrl
 
       contentManager.removeAllContents(false);
 
-      // I don't understand this part. Does this become significant when multiple tabs?
-      //if (contents.get(tabName) != null) {
-      //  contents.remove(tabName);
-      //}
       for (final String otherTabName: tabs.keySet()) {
         if (otherTabName.equals(tabName)) {
           continue;
         }
         final BrowserTab browserTab = tabs.get(otherTabName);
         contentManager.addContent(browserTab.content);
       }
-      //final Content previousContent = contents.get(tabName);
-      //if (previousContent != null) {
-      //  contentManager.setSelectedContent(previousContent, true);
-      //  return;
-      //}
 
       tab.content = contentManager.getFactory().createContent(null, tabName, false);
       tab.content.setComponent(component);