Use FrameIsAd to decide whether to isolate a frame in TopDocumentIsolation mode.

content/browser/top_document_isolation_browsertest.cc

Index: content/browser/top_document_isolation_browsertest.cc
diff --git a/content/browser/top_document_isolation_browsertest.cc b/content/browser/top_document_isolation_browsertest.cc
index be1fa6e4565e9c832525e88effca4441e07634fa..944f8119142944067cc6213a7f513a8570889338 100644
--- a/content/browser/top_document_isolation_browsertest.cc
+++ b/content/browser/top_document_isolation_browsertest.cc
@@ -5,7 +5,6 @@
 #include <string>
 
 #include "base/command_line.h"
-#include "base/test/scoped_feature_list.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/common/content_features.h"
@@ -31,9 +30,9 @@ class TopDocumentIsolationTest : public ContentBrowserTest {
     return visualizer_.DepictFrameTree(node);
   }
 
-  void SetUp() override {
-    scoped_feature_list_.InitAndEnableFeature(features::kTopDocumentIsolation);
-    ContentBrowserTest::SetUp();
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    ContentBrowserTest::SetUpCommandLine(command_line);
+    content::EnableTopDocumentIsolationForTesting(command_line);
   }
 
   void SetUpOnMainThread() override {
@@ -69,7 +68,6 @@ class TopDocumentIsolationTest : public ContentBrowserTest {
 
  private:
   FrameTreeVisualizer visualizer_;
-  base::test::ScopedFeatureList scoped_feature_list_;
 
   DISALLOW_COPY_AND_ASSIGN(TopDocumentIsolationTest);
 };