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

content/public/test/test_utils.h

Index: content/public/test/test_utils.h
diff --git a/content/public/test/test_utils.h b/content/public/test/test_utils.h
index 7ca3cf7b47f6eccaf8da51ffb4fb4daea86ddcd3..330210f929b218833e688f1f30e1fac6e5d33a7b 100644
--- a/content/public/test/test_utils.h
+++ b/content/public/test/test_utils.h
@@ -6,7 +6,6 @@
 #define CONTENT_PUBLIC_TEST_TEST_UTILS_H_
 
 #include <memory>
-#include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
@@ -100,11 +99,6 @@
                             const std::string& param_value,
                             base::CommandLine* command_line);
 
-// Mutates |command_line| to enable a testing mode for TopDocumentIsolation by
-// 1) enabling the features::kTopDocumentIsolation feature and 2) forcing a mode
-// that isolates all cross-site frames.
-void EnableTopDocumentIsolationForTesting(base::CommandLine* command_line);
-
 #if defined(OS_ANDROID)
 // Registers content/browser JNI bindings necessary for some types of tests.
 bool RegisterJniForTesting(JNIEnv* env);
@@ -131,7 +125,7 @@
     DEFERRED,
   };
 
-  explicit MessageLoopRunner(QuitMode mode = QuitMode::DEFERRED);
+  MessageLoopRunner(QuitMode mode = QuitMode::DEFERRED);
 
   // Run the current MessageLoop unless the quit closure
   // has already been called.
@@ -293,7 +287,7 @@
 // accessing it and causing use-after-free condition.
 class RenderFrameDeletedObserver : public WebContentsObserver {
  public:
-  explicit RenderFrameDeletedObserver(RenderFrameHost* rfh);
+  RenderFrameDeletedObserver(RenderFrameHost* rfh);
   ~RenderFrameDeletedObserver() override;
 
   // Overridden WebContentsObserver methods.