Remove unused CPDFXFA_Context::m_pRuntime member.

Also remove some unused forward declarations.

Change-Id: I3d52f47c26bc551544748d3f93cf5a79969258df
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/71334
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

fpdfsdk/fpdfxfa/cpdfxfa_context.h

diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_context.h b/fpdfsdk/fpdfxfa/cpdfxfa_context.h
index 017545e..dc905a7 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_context.h
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_context.h
@@ -22,9 +22,6 @@
 #include "xfa/fxfa/cxfa_ffdoc.h"
 
 class CJS_Runtime;
-class CXFA_FFDocHandler;
-class IJS_EventContext;
-class IJS_Runtime;
 
 enum LoadStatus {
   FXFA_LOADSTATUS_PRELOAD = 0,
@@ -121,7 +118,6 @@
   ObservedPtr<CPDFSDK_FormFillEnvironment> m_pFormFillEnv;
   UnownedPtr<CXFA_FFDocView> m_pXFADocView;
   std::unique_ptr<CXFA_FFApp> const m_pXFAApp;
-  std::unique_ptr<CJS_Runtime> m_pRuntime;
   std::vector<RetainPtr<CPDFXFA_Page>> m_XFAPageList;
   LoadStatus m_nLoadStatus = FXFA_LOADSTATUS_PRELOAD;
   int m_nPageCount = 0;