Remove unused files: files_safe_img.{js,html}

ui/file_manager/file_manager/foreground/elements/files_safe_img.js

-// 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.
-
-var FILES_APP_ORIGIN = 'chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj';
-
-/**
- * Polymer element to render an image securely inside webview.
- * When tapped, files-safe-img-tap-inside or
- * files-safe-img-tap-outside events are fired depending on the position
- * of the tap.
- */
-var FilesSafeImg = Polymer({
-  is: 'files-safe-img',
-
-  properties: {
-    // URL accessible from webview.
-    src: {
-      type: String,
-      observer: 'onSrcChange_',
-      reflectToAttribute: true
-    }
-  },
-
-  listeners: {'src-changed': 'onSrcChange_'},
-
-  onSrcChange_: function() {
-    if (!this.src && this.webview_) {
-      // Remove webview to clean up unnecessary processes.
-      Polymer.dom(this.$.content).removeChild(this.webview_);
-      this.webview_ = null;
-    } else if (this.src && !this.webview_) {
-      // Create webview node only if src exists to save resouces.
-      var webview = document.createElement('webview');
-      this.webview_ = webview;
-      webview.partition = 'trusted';
-      webview.allowtransparency = 'true';
-      Polymer.dom(this.$.content).appendChild(webview);
-      webview.addEventListener(
-          'contentload', this.onSrcChange_.bind(this));
-      webview.src = 'foreground/elements/files_safe_img_webview_content.html';
-    } else if (this.src && this.webview_.contentWindow) {
-      this.webview_.contentWindow.postMessage(this.src, FILES_APP_ORIGIN);
-    }
-  },
-
-  created: function() {
-    /**
-     * @type {HTMLElement}
-     */
-    this.webview_ = null;
-  },
-
-  ready: function() {
-    window.addEventListener('message', function(event) {
-      if (event.origin !== FILES_APP_ORIGIN) {
-        console.error('Unknown origin.');
-        return;
-      }
-      if (event.data === 'tap-inside') {
-        this.fire('files-safe-img-tap-inside');
-      } else if (event.data === 'tap-outside') {
-        this.fire('files-safe-img-tap-outside');
-      }
-    }.bind(this));
-  }
-});