Only handle click actions for left & middle buttons

chrome/browser/resources/md_downloads/crisper.js

Index: chrome/browser/resources/md_downloads/crisper.js
diff --git a/chrome/browser/resources/md_downloads/crisper.js b/chrome/browser/resources/md_downloads/crisper.js
index 55db37276f878b9e72f751573f00b9f95113255b..e78cb0824f8afad58b51ad06c32985558763a8a3 100644
--- a/chrome/browser/resources/md_downloads/crisper.js
+++ b/chrome/browser/resources/md_downloads/crisper.js
@@ -648,6 +648,7 @@ function queryRequiredElement(selectors, opt_context) {
 
 [ 'click', 'auxclick' ].forEach(function(eventName) {
   document.addEventListener(eventName, function(e) {
+    if (e.button > 1) return;
     if (e.defaultPrevented) return;
     var eventPath = e.path;
     var anchor = null;
@@ -733,6 +734,19 @@ function quoteString(str) {
   return str.replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:])/g, '\\$1');
 }
 
+function listenOnce(target, eventNames, callback) {
+  if (!Array.isArray(eventNames)) eventNames = eventNames.split(/ +/);
+  var removeAllAndCallCallback = function(event) {
+    eventNames.forEach(function(eventName) {
+      target.removeEventListener(eventName, removeAllAndCallCallback, false);
+    });
+    return callback(event);
+  };
+  eventNames.forEach(function(eventName) {
+    target.addEventListener(eventName, removeAllAndCallCallback, false);
+  });
+}
+
 // <if expr="is_ios">
 if (!('key' in KeyboardEvent.prototype)) {
   Object.defineProperty(KeyboardEvent.prototype, 'key', {