Remove unused files: files_safe_img.{js,html}

ui/file_manager/file_manager/foreground/elements/files_safe_img.html

Index: ui/file_manager/file_manager/foreground/elements/files_safe_img.html
diff --git a/ui/file_manager/file_manager/foreground/elements/files_safe_img.html b/ui/file_manager/file_manager/foreground/elements/files_safe_img.html
deleted file mode 100644
index 1eaf84a43ddcfd995a808373777a7d40f4c7962e..0000000000000000000000000000000000000000
--- a/ui/file_manager/file_manager/foreground/elements/files_safe_img.html
+++ /dev/null
@@ -1,23 +0,0 @@
-<!-- Copyright 2016 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.
--->
-
-<dom-module id="files-safe-img">
-  <style>
-    #content {
-      height: 100%;
-      width: 100%;
-    }
-    webview {
-      display: inline-block;
-      height: 100%;
-      width: 100%;
-    }
-  </style>
-  <template>
-    <div id="content"></div>
-  </template>
-</dom-module>
-
-<script src="files_safe_img.js"></script>