Create an interactive site-per-process browsertest class and move DocumentHasFocus there.

chrome/browser/chrome_site_per_process_browsertest.cc

 // Copyright 2014 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.
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 52 matching lines @@
   GURL main_url(embedded_test_server()->GetURL("a.com", "/iframe.html"));
   ui_test_utils::NavigateToURL(browser(), main_url);
 
   // Navigate subframe cross-site.
   content::WebContents* active_web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   GURL cross_site_url(embedded_test_server()->GetURL("b.com", "/title2.html"));
   EXPECT_TRUE(NavigateIframeToURL(active_web_contents, "test", cross_site_url));
 
   // Find the subframe's RenderFrameHost.
-  content::RenderFrameHost* frame_host = FrameMatchingPredicate(
-      active_web_contents,
-      base::Bind(&content::FrameHasSourceUrl, cross_site_url));
+  content::RenderFrameHost* frame_host =
+      ChildFrameAt(active_web_contents->GetMainFrame(), 0);
   ASSERT_TRUE(frame_host);
+  EXPECT_EQ(cross_site_url, frame_host->GetLastCommittedURL());
   EXPECT_TRUE(frame_host->IsCrossProcessSubframe());
 
   // Check that JS storage APIs can be accessed successfully.
   EXPECT_TRUE(
       content::ExecuteScript(frame_host, "localStorage['foo'] = 'bar'"));
   std::string result;
   EXPECT_TRUE(ExecuteScriptAndExtractString(
       frame_host, "window.domAutomationController.send(localStorage['foo']);",
       &result));
   EXPECT_EQ(result, "bar");
@@ skipping 84 matching lines @@
       main_lost_focus = true;
     if (status == "\"popup-got-focus\"")
       popup_got_focus = true;
     if (main_lost_focus && popup_got_focus)
       break;
   }
 
   // The popup should be focused now.
   EXPECT_EQ(popup, browser()->tab_strip_model()->GetActiveWebContents());
 }