DevTools: Extenstions: use request.contentEncoded for GetRequestContent

Source/devtools/front_end/extensions/ExtensionServer.js

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 542 matching lines @@
      * @param {!MessagePort} port
      */
     _getResourceContent: function(contentProvider, message, port)
     {
         /**
          * @param {?string} content
          * @this {WebInspector.ExtensionServer}
          */
         function onContentAvailable(content)
         {
+            var contentEncoded = false;
+            if (contentProvider instanceof WebInspector.Resource)
+                contentEncoded = contentProvider.contentEncoded;
+            if (contentProvider instanceof WebInspector.NetworkRequest)
+                contentEncoded = contentProvider.contentEncoded;
             var response = {
-                encoding: (content === null) || contentProvider.contentType().isTextType() ? "" : "base64",
+                encoding: contentEncoded && content ? "base64" : "",
                 content: content
             };
             this._dispatchCallback(message.requestId, port, response);
         }
 
         contentProvider.requestContent(onContentAvailable.bind(this));
     },
 
     _onGetRequestContent: function(message, port)
     {
@@ skipping 529 matching lines @@
 {
     if (WebInspector.extensionServer._overridePlatformExtensionAPIForTest)
         window.buildPlatformExtensionAPI = WebInspector.extensionServer._overridePlatformExtensionAPIForTest;
     WebInspector.extensionServer._addExtensions(extensions);
 }
 
 WebInspector.setInspectedTabId = function(tabId)
 {
     WebInspector._inspectedTabId = tabId;
 }