chore: 迁移 dropdown iconfont 组件

components/dropdown/demo/basic.md

@@ -9,6 +9,7 @@
 ````jsx
 var Menu = antd.Menu;
 var Dropdown = antd.Dropdown;
+var Icon = antd.Icon;
 
 var menu = <Menu>
   <Menu.Item>
@@ -25,7 +26,7 @@ var menu = <Menu>
 React.render(
   <Dropdown overlay={menu}>
     <button className="ant-btn ant-btn-menu">
-      某按钮 <i className="anticon anticon-down"></i>
+      某按钮 <Icon type="down" />
     </button>
   </Dropdown>
 , document.getElementById('components-dropdown-demo-basic'));

components/dropdown/demo/event.md

@@ -9,6 +9,7 @@
 ````jsx
 var Menu = antd.Menu;
 var Dropdown = antd.Dropdown;
+var Icon = antd.Icon;
 var onSelect = function ({key}){
   alert('选中了菜单' + key);
 };
@@ -22,7 +23,7 @@ var menu = <Menu onSelect={onSelect}>
 React.render(
   <Dropdown overlay={menu}>
     <button className="ant-btn ant-btn-menu">
-      鼠标移入，点击菜单 <i className="anticon anticon-down"></i>
+      鼠标移入，点击菜单 <Icon type="down" />
     </button>
   </Dropdown>
 , document.getElementById('components-dropdown-demo-event'));

components/dropdown/demo/item.md

@@ -9,6 +9,7 @@
 ````jsx
 var Menu = antd.Menu;
 var Dropdown = antd.Dropdown;
+var Icon = antd.Icon;
 
 var menu = <Menu>
   <Menu.Item key="0">
@@ -24,7 +25,7 @@ var menu = <Menu>
 React.render(
   <Dropdown overlay={menu}>
     <button className="ant-btn ant-btn-menu">
-      鼠标移入 <i className="anticon anticon-down"></i>
+      鼠标移入 <Icon type="down" />
     </button>
   </Dropdown>
 , document.getElementById('components-dropdown-demo-item'));

components/dropdown/demo/trigger.md

@@ -9,6 +9,7 @@
 ````jsx
 var Menu = antd.Menu;
 var Dropdown = antd.Dropdown;
+var Icon = antd.Icon;
 
 var menu = <Menu>
   <Menu.Item key="0">
@@ -24,12 +25,12 @@ var menu = <Menu>
 React.render(<div>
   <Dropdown overlay={menu} trigger="click">
     <button className="ant-btn ant-btn-primary ant-btn-menu">
-      点击触发 <i className="anticon anticon-down"></i>
+      点击触发 <Icon type="down" />
     </button>
   </Dropdown>
   <Dropdown overlay={menu}>
     <button className="ant-btn ant-btn-menu">
-      鼠标移入 <i className="anticon anticon-down"></i>
+      鼠标移入 <Icon type="down" />
     </button>
   </Dropdown>
 </div>, document.getElementById('components-dropdown-demo-trigger'));