PDF viewer: Specify tabId when navigating with chrome.tabs.update.

chrome/browser/resources/pdf/pdf.js

Index: chrome/browser/resources/pdf/pdf.js
diff --git a/chrome/browser/resources/pdf/pdf.js b/chrome/browser/resources/pdf/pdf.js
index 8db8ba16f94a559e8e11c943398ea1669d866b68..118c50bbd4b0fd4591d6e7d2a4c8f98b1184ccc1 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -246,10 +246,10 @@ function PDFViewer(browserApi) {
   document.addEventListener('mousemove', this.handleMouseEvent_.bind(this));
   document.addEventListener('mouseout', this.handleMouseEvent_.bind(this));
 
-  var isInTab = this.browserApi_.getStreamInfo().tabId != -1;
+  var tabId = this.browserApi_.getStreamInfo().tabId;
   this.navigator_ = new Navigator(
       this.originalUrl_, this.viewport_, this.paramsParser_,
-      new NavigatorDelegate(isInTab));
+      new NavigatorDelegate(tabId));
   this.viewportScroller_ =
       new ViewportScroller(this.viewport_, this.plugin_, window);