Set up Finch trial for malware download warnings

chrome/browser/resources/downloads/downloads.js

 // Copyright (c) 2012 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.
 
 // TODO(jhawkins): Use hidden instead of showInline* and display:none.
 
 /**
  * Sets the display style of a node.
  * @param {!Element} node The target element to show or hide.
  * @param {boolean} isShow Should the target element be visible.
@@ skipping 405 matching lines @@
  */
 Download.prototype.update = function(download) {
   this.id_ = download.id;
   this.filePath_ = download.file_path;
   this.fileUrl_ = download.file_url;
   this.fileName_ = download.file_name;
   this.url_ = download.url;
   this.state_ = download.state;
   this.fileExternallyRemoved_ = download.file_externally_removed;
   this.dangerType_ = download.danger_type;
+  this.finchString_ = download.finch_string;
   this.lastReasonDescription_ = download.last_reason_text;
   this.byExtensionId_ = download.by_ext_id;
   this.byExtensionName_ = download.by_ext_name;
 
   this.since_ = download.since_string;
   this.date_ = download.date_string;
 
   // See DownloadItem::PercentComplete
   this.percent_ = Math.max(download.percent, 0);
   this.progressStatusText_ = download.progress_status_text;
   this.received_ = download.received;
 
   if (this.state_ == Download.States.DANGEROUS) {
     if (this.dangerType_ == Download.DangerType.DANGEROUS_FILE) {
       this.dangerDesc_.textContent = loadTimeData.getStringF('danger_file_desc',
                                                              this.fileName_);
     } else if (this.dangerType_ == Download.DangerType.DANGEROUS_URL) {
       this.dangerDesc_.textContent = loadTimeData.getString('danger_url_desc');
     } else if (this.dangerType_ == Download.DangerType.DANGEROUS_CONTENT ||
                this.dangerType_ == Download.DangerType.DANGEROUS_HOST) {
       this.dangerDesc_.textContent = loadTimeData.getStringF(
           'danger_content_desc', this.fileName_);
     } else if (this.dangerType_ == Download.DangerType.UNCOMMON_CONTENT) {
       this.dangerDesc_.textContent = loadTimeData.getStringF(
           'danger_uncommon_desc', this.fileName_);
     } else if (this.dangerType_ == Download.DangerType.POTENTIALLY_UNWANTED) {
       this.dangerDesc_.textContent = loadTimeData.getStringF(
           'danger_potentially_unwanted_desc', this.fileName_);
     }
+    if (this.finchString_) {
+      // Finch trial overrides the normal display string.
+      this.dangerDesc_.textContent = this.finchString_;
+    }
     this.danger_.style.display = 'block';
     this.safe_.style.display = 'none';
   } else {
     downloads.scheduleIconLoad(this.nodeImg_,
                                'chrome://fileicon/' +
                                    encodeURIComponent(this.filePath_) +
                                    '?scale=' + window.devicePixelRatio + 'x');
 
     if (this.state_ == Download.States.COMPLETE &&
         !this.fileExternallyRemoved_) {
@@ skipping 345 matching lines @@
     if (Date.now() - start > 50) {
       clearTimeout(resultsTimeout);
       resultsTimeout = setTimeout(tryDownloadUpdatedPeriodically, 5);
       break;
     }
   }
 }
 
 // Add handlers to HTML elements.
 window.addEventListener('DOMContentLoaded', load);