Set the file name of the webrtc-internals dump "webrtc_internals_dump.txt".

BUG=398827

Review URL: https://codereview.chromium.org/448503002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287719 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/resources/media/dump_creator.js

@@ -86,7 +86,9 @@ var DumpCreator = (function() {
                               {type: 'octet/stream'});
       var URL = window.URL.createObjectURL(textBlob);
 
-      this.root_.getElementsByTagName('a')[0].href = URL;
+      var anchor = this.root_.getElementsByTagName('a')[0];
+      anchor.href = URL;
+      anchor.download = 'webrtc_internals_dump.txt';
       // The default action of the anchor will download the URL.
     },