Remove unused method CPDFSDK_Widget::GetInteractiveForm()

It is no longer called.

Change-Id: Iaf7ea0992695d109a7fd444ef698c5832b7e8cd6
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/99413
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Auto-Submit: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

fpdfsdk/cpdfsdk_widget.h

diff --git a/fpdfsdk/cpdfsdk_widget.h b/fpdfsdk/cpdfsdk_widget.h
index 9d4090b..c7dad0b 100644
--- a/fpdfsdk/cpdfsdk_widget.h
+++ b/fpdfsdk/cpdfsdk_widget.h
@@ -122,9 +122,6 @@
                  CFFL_FieldAction* data,
                  const CPDFSDK_PageView* pPageView);
 
-  CPDFSDK_InteractiveForm* GetInteractiveForm() const {
-    return m_pInteractiveForm.Get();
-  }
   CPDF_FormField* GetFormField() const;
   CPDF_FormControl* GetFormControl() const;