Remove duplication between TestRunner's fields and LayoutDumpFlags struct.

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 72ddca65dae1f5241239f47479aebb4f9ffbdfc9..6c7132a620bc02b8ad0c026204f5dd4bf4af334b 100644
--- a/content/shell/browser/layout_test/blink_test_controller.h
+++ b/content/shell/browser/layout_test/blink_test_controller.h
@@ -16,7 +16,6 @@
 #include "base/synchronization/lock.h"
 #include "base/threading/non_thread_safe.h"
 #include "build/build_config.h"
-#include "components/test_runner/layout_dump_flags.h"
 #include "content/public/browser/bluetooth_chooser.h"
 #include "content/public/browser/gpu_data_manager_observer.h"
 #include "content/public/browser/notification_observer.h"
@@ -32,6 +31,10 @@
 
 class SkBitmap;
 
+namespace test_runner {
+struct LayoutDumpFlags;
+}
+
 namespace url {
 class Origin;
 }
@@ -180,7 +183,8 @@ class BlinkTestController : public base::NonThreadSafe,
   void OnAudioDump(const std::vector<unsigned char>& audio_dump);
   void OnImageDump(const std::string& actual_pixel_hash, const SkBitmap& image);
   void OnTextDump(const std::string& dump);
-  void OnInitiateLayoutDump(test_runner::LayoutDumpFlags layout_dump_flags);
+  void OnInitiateLayoutDump(
+      const test_runner::LayoutDumpFlags& layout_dump_flags);
   void OnLayoutDumpResponse(RenderFrameHost* sender, const std::string& dump);
   void OnPrintMessage(const std::string& message);
   void OnOverridePreferences(const WebPreferences& prefs);