Revert of Replace IPC messages in layout_test_render_frame_observer.

content/shell/browser/layout_test/blink_test_controller.h

Index: content/shell/browser/layout_test/blink_test_controller.h
diff --git a/content/shell/browser/layout_test/blink_test_controller.h b/content/shell/browser/layout_test/blink_test_controller.h
index 388ac5f433ec8f04dee44a87a6090b03f55c7bfd..2d7f699051aebf07dc3e91bfe53b4ac646876e91 100644
--- a/content/shell/browser/layout_test/blink_test_controller.h
+++ b/content/shell/browser/layout_test/blink_test_controller.h
@@ -26,7 +26,6 @@
 #include "content/public/browser/render_process_host_observer.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/web_preferences.h"
-#include "content/shell/common/layout_test.mojom.h"
 #include "content/shell/common/leak_detection_result.h"
 #include "ui/gfx/geometry/size.h"
 
@@ -216,7 +215,6 @@
   void OnGetBluetoothManualChooserEvents();
   void OnSendBluetoothManualChooserEvent(const std::string& event,
                                          const std::string& argument);
-  mojom::LayoutTestControl* GetLayoutTestControlPtr(RenderFrameHost* frame);
 
   std::unique_ptr<BlinkTestResultPrinter> printer_;
 
@@ -280,9 +278,6 @@
   // renderer created while test is in progress).
   base::DictionaryValue accumulated_layout_test_runtime_flags_changes_;
 
-  // Map from one frame to one mojo pipe.
-  std::map<RenderFrameHost*, mojom::LayoutTestControlAssociatedPtr>
-      layout_test_control_map_;
 #if defined(OS_ANDROID)
   // Because of the nested message pump implementation, Android needs to allow
   // waiting on the UI thread while layout tests are being ran.