Make 'See more' button in suggest apps dialog keyboard accessible

ui/file_manager/file_manager/foreground/css/file_manager.css

Index: ui/file_manager/file_manager/foreground/css/file_manager.css
diff --git a/ui/file_manager/file_manager/foreground/css/file_manager.css b/ui/file_manager/file_manager/foreground/css/file_manager.css
index 6b76816f74805010aa4909d2448d8ad8c98d723f..81f41b788eb4beb6b507f7bce43b668a9c0b1101 100644
--- a/ui/file_manager/file_manager/foreground/css/file_manager.css
+++ b/ui/file_manager/file_manager/foreground/css/file_manager.css
@@ -1795,18 +1795,29 @@ list.autocomplete-suggestions > [lead] {
 
 #suggest-app-dialog #buttons > #webstore-button {
   -webkit-padding-end: 10px;
-  -webkit-padding-start: 36px;
+  -webkit-padding-start: 12px;
+  color: #00f;
+  cursor: pointer;
+  display: flex;
+  height: 16px;
+  padding-bottom: 10px;
+  padding-top: 10px;
+}
+
+#suggest-app-dialog #buttons > #webstore-button > #webstore-button-icon {
+  -webkit-margin-end: 8px;
   background-image: -webkit-image-set(
     url(chrome://theme/IDR_WEBSTORE_ICON_16) 1x,
     url(chrome://theme/IDR_WEBSTORE_ICON_16@2x) 2x);
-  background-position: 12px center;
   background-repeat: no-repeat;
-  color: #00f;
-  cursor: pointer;
   display: inline-block;
   height: 16px;
-  padding-bottom: 10px;
-  padding-top: 10px;
+  width: 16px;
+}
+
+#suggest-app-dialog #buttons > #webstore-button > #webstore-button-label {
+  flex: 1;
+  line-height: 16px;
 }
 
 .cr-dialog-frame.error-dialog-frame {