Removed diagnostics code from TouchSelectionControllerImpl

Bug: 459423
Change-Id: I33d21c8e23f1544f8ad68a9f58db57a5a3ce1874
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216634
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773078}

ui/views/touchui/touch_selection_controller_impl.cc

@@ -271,14 +271,7 @@ class TouchSelectionControllerImpl::EditingHandleView
       }
       case ui::ET_GESTURE_SCROLL_END:
       case ui::ET_SCROLL_FLING_START: {
-        // Use a weak pointer to the handle to make sure the handle and its
-        // owning selection controller is not destroyed by the capture release
-        // to diagnose a crash on Windows (see crbug.com/459423)
-        // TODO(mohsen): Delete the diagnostics code when the crash is fixed.
-        base::WeakPtr<EditingHandleView> weak_ptr =
-            weak_ptr_factory_.GetWeakPtr();
         widget_->ReleaseCapture();
-        CHECK(weak_ptr);
         controller_->SetDraggingHandle(nullptr);
         break;
       }
@@ -386,8 +379,6 @@ class TouchSelectionControllerImpl::EditingHandleView
   // handle.
   bool draw_invisible_;
 
-  base::WeakPtrFactory<EditingHandleView> weak_ptr_factory_{this};
-
   DISALLOW_COPY_AND_ASSIGN(EditingHandleView);
 };