Reland "Simplify FrameLoader::Clear(), remove FrameLoader::check_timer"

third_party/WebKit/Source/core/loader/FrameLoader.h

Index: third_party/WebKit/Source/core/loader/FrameLoader.h
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.h b/third_party/WebKit/Source/core/loader/FrameLoader.h
index 75fbc7e09158957c78863265dea813682f81d9c8..e2b159cd43a991ddeb0796b68b9614a6ddb95d2b 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.h
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.h
@@ -42,7 +42,6 @@
 #include "core/loader/FrameLoaderTypes.h"
 #include "core/loader/HistoryItem.h"
 #include "core/loader/NavigationPolicy.h"
-#include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "platform/instrumentation/tracing/TracedValue.h"
 #include "platform/loader/fetch/ResourceLoaderOptions.h"
@@ -227,8 +226,6 @@ class CORE_EXPORT FrameLoader final {
   static void SetReferrerForFrameRequest(FrameLoadRequest&);
 
  private:
-  void CheckTimerFired(TimerBase*);
-
   bool PrepareRequestForThisFrame(FrameLoadRequest&);
   FrameLoadType DetermineFrameLoadType(const FrameLoadRequest&);
 
@@ -291,8 +288,6 @@ class CORE_EXPORT FrameLoader final {
 
   bool in_stop_all_loaders_;
 
-  TaskRunnerTimer<FrameLoader> check_timer_;
-
   SandboxFlags forced_sandbox_flags_;
 
   bool dispatching_did_clear_window_object_in_main_world_;