Links in PDF should open in a new window when shift + left clicked.

chrome/browser/resources/pdf/pdf.js

 // Copyright 2013 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.
 
 'use strict';
 
 /**
  * @return {number} Width of a scrollbar in pixels
  */
 function getScrollbarWidth() {
@@ skipping 22 matching lines @@
   try {
     return decodeURIComponent(filename);
   } catch (e) {
     if (e instanceof URIError)
       return filename;
     throw e;
   }
 }
 
 /**
- * Called when navigation happens in the current tab.
- * @param {boolean} isInTab Indicates if the PDF viewer is displayed in a tab.
- * @param {boolean} isSourceFileUrl Indicates if the navigation source is a
- *     file:// URL.
- * @param {string} url The url to be opened in the current tab.
- */
-function onNavigateInCurrentTab(isInTab, isSourceFileUrl, url) {
-  // When the PDFviewer is inside a browser tab, prefer the tabs API because
-  // it can navigate from one file:// URL to another.
-  if (chrome.tabs && isInTab && isSourceFileUrl)
-    chrome.tabs.update({url: url});
-  else
-    window.location.href = url;
-}
-
-/**
- * Called when navigation happens in the new tab.
- * @param {string} url The url to be opened in the new tab.
- * @param {boolean} active Indicates if the new tab should be the active tab.
- */
-function onNavigateInNewTab(url, active) {
-  // Prefer the tabs API because it guarantees we can just open a new tab.
-  // window.open doesn't have this guarantee.
-  if (chrome.tabs)
-    chrome.tabs.create({url: url, active: active});
-  else
-    window.open(url);
-}
-
-/**
  * Whether keydown events should currently be ignored. Events are ignored when
  * an editable element has focus, to allow for proper editing controls.
  * @param {HTMLElement} activeElement The currently selected DOM node.
  * @return {boolean} True if keydown events should be ignored.
  */
 function shouldIgnoreKeyEvents(activeElement) {
   while (activeElement.shadowRoot != null &&
          activeElement.shadowRoot.activeElement != null) {
     activeElement = activeElement.shadowRoot.activeElement;
   }
@@ skipping 170 matching lines @@
   this.browserApi_.addZoomEventListener(
       this.zoomManager_.onBrowserZoomChange.bind(this.zoomManager_));
 
   // Setup the keyboard event listener.
   document.addEventListener('keydown', this.handleKeyEvent_.bind(this));
   document.addEventListener('mousemove', this.handleMouseEvent_.bind(this));
   document.addEventListener('mouseout', this.handleMouseEvent_.bind(this));
 
   var isInTab = this.browserApi_.getStreamInfo().tabId != -1;
   var isSourceFileUrl = this.originalUrl_.indexOf('file://') == 0;
-  this.navigator_ = new Navigator(this.originalUrl_,
-                                  this.viewport_, this.paramsParser_,
-                                  onNavigateInCurrentTab.bind(undefined,
-                                                              isInTab,
-                                                              isSourceFileUrl),
-                                  onNavigateInNewTab);
+  this.navigator_ = new Navigator(
+      this.originalUrl_, this.viewport_, this.paramsParser_,
+      new NavigatorDelegate(isInTab, isSourceFileUrl));
   this.viewportScroller_ =
       new ViewportScroller(this.viewport_, this.plugin_, window);
 
   // Request translated strings.
   chrome.resourcesPrivate.getStrings('pdf', this.handleStrings_.bind(this));
 }
 
 PDFViewer.prototype = {
   /**
    * @private
@@ skipping 609 matching lines @@
    * Each bookmark is an Object containing a:
    * - title
    * - page (optional)
    * - array of children (themselves bookmarks)
    * @type {Array} the top-level bookmarks of the PDF.
    */
   get bookmarks() {
     return this.bookmarks_;
   }
 };