SitePerProcessBrowserTest: make some tests to use cross_site_iframe_factory

content/browser/site_per_process_browsertest.h

Index: content/browser/site_per_process_browsertest.h
diff --git a/content/browser/site_per_process_browsertest.h b/content/browser/site_per_process_browsertest.h
index 9e74bd70ee0ba37cf044174722bf85f206eb2abd..16db097ed49ecb0bee58f427169f791f31003ef5 100644
--- a/content/browser/site_per_process_browsertest.h
+++ b/content/browser/site_per_process_browsertest.h
@@ -21,11 +21,6 @@ class SitePerProcessBrowserTest : public ContentBrowserTest {
   SitePerProcessBrowserTest();
 
  protected:
-  // Start at a data URL so each extra navigation creates a navigation entry.
-  // (The first navigation will silently be classified as AUTO_SUBFRAME.)
-  // TODO(creis): This won't be necessary when we can wait for LOAD_STOP.
-  void StartFrameAtDataURL();
-
   std::string DepictFrameTree(FrameTreeNode* node);
 
   void SetUpCommandLine(base::CommandLine* command_line) override;