Add download icon, use for "Export".

packages/edit-site/src/plugins/index.js

@@ -11,6 +11,7 @@ import { __ } from '@wordpress/i18n';
 import { registerPlugin } from '@wordpress/plugins';
 import { addQueryArgs } from '@wordpress/url';
 import apiFetch from '@wordpress/api-fetch';
+import { download } from '@wordpress/icons';
 
 /**
  * Internal dependencies
@@ -24,7 +25,7 @@ registerPlugin( 'edit-site', {
 				<ToolsMoreMenuGroup>
 					<MenuItem
 						role="menuitem"
-						icon="download"
+						icon={ download }
 						onClick={ () =>
 							apiFetch( {
 								path: '/__experimental/edit-site/v1/export',

packages/icons/src/index.js

@@ -50,6 +50,7 @@ export { default as currencyDollar } from './library/currency-dollar';
 export { default as currencyEuro } from './library/currency-euro';
 export { default as currencyPound } from './library/currency-pound';
 export { default as desktop } from './library/desktop';
+export { default as download } from './library/download';
 export { default as edit } from './library/edit';
 export { default as external } from './library/external';
 export { default as file } from './library/file';

packages/icons/src/library/download.js

@@ -0,0 +1,12 @@
+/**
+ * WordPress dependencies
+ */
+import { SVG, Path } from '@wordpress/primitives';
+
+const download = (
+	<SVG xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
+		<Path d="M18 11.3l-1-1.1-4 4V3h-1.5v11.3L7 10.2l-1 1.1 6.2 5.8 5.8-5.8zm.5 3.7v3.5h-13V15H4v5h16v-5h-1.5z" />
+	</SVG>
+);
+
+export default download;