Links in PDF should be opened in new background tabs when ctrl + left clicked.

chrome/browser/pdf/pdf_extension_test.cc

Index: chrome/browser/pdf/pdf_extension_test.cc
diff --git a/chrome/browser/pdf/pdf_extension_test.cc b/chrome/browser/pdf/pdf_extension_test.cc
index 03e31b51bde9ee73a924cd5b5c8d0e1ad9a9c00f..f1d05b98cd82d226d9b50985d96938f1ad5d66eb 100644
--- a/chrome/browser/pdf/pdf_extension_test.cc
+++ b/chrome/browser/pdf/pdf_extension_test.cc
@@ -632,10 +632,14 @@ IN_PROC_BROWSER_TEST_F(PDFExtensionTest, LinkMiddleClick) {
   int tab_count = browser()->tab_strip_model()->count();
   ASSERT_EQ(2, tab_count);
 
-  // TODO(jaepark): Middle mouse clicking on a link should not change
-  // the focus of the tab. See http://crbug.com/628054.
-  content::WebContents* new_web_contents =
+  content::WebContents* active_web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
+  ASSERT_EQ(web_contents, active_web_contents);
+
+
+  content::WebContents* new_web_contents =
+      browser()->tab_strip_model()->GetWebContentsAt(1);
+  ASSERT_TRUE(new_web_contents);
   ASSERT_NE(web_contents, new_web_contents);
 
   const GURL& url = new_web_contents->GetURL();