Fix a data URL generation code in DeveloperPrivateAPI

chrome/browser/extensions/api/developer_private/developer_private_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/developer_private/developer_private_api.h"
 
 #include "apps/app_load_service.h"
 #include "apps/app_restore_service.h"
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
@@ skipping 83 matching lines @@
 
 ExtensionUpdater* GetExtensionUpdater(Profile* profile) {
     return profile->GetExtensionService()->updater();
 }
 
 GURL GetImageURLFromData(const std::string& contents) {
   std::string contents_base64;
   base::Base64Encode(contents, &contents_base64);
 
   // TODO(dvh): make use of content::kDataScheme. Filed as crbug/297301.
-  const char kDataURLPrefix[] = "data:image;base64,";
+  const char kDataURLPrefix[] = "data:;base64,";
   return GURL(kDataURLPrefix + contents_base64);
 }
 
 GURL GetDefaultImageURL(developer_private::ItemType type) {
   int icon_resource_id;
   switch (type) {
     case developer::ITEM_TYPE_LEGACY_PACKAGED_APP:
     case developer::ITEM_TYPE_HOSTED_APP:
     case developer::ITEM_TYPE_PACKAGED_APP:
       icon_resource_id = IDR_APP_DEFAULT_ICON;
@@ skipping 1244 matching lines @@
   }
 
   error_ui_util::HandleOpenDevTools(dict);
 
   return true;
 }
 
 }  // namespace api
 
 }  // namespace extensions