Merge to XFA: Cleanup: Remove CFFL_IFormFiller::GetCommitKey() that always returns 0.

Remove callers and related code that all just pass zeros around.

Also remove CFFL_IFormFiller::GetKeyDown().

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1149623012.

(cherry picked from commit 35c3163d55bebea8095474181f807ddfb2f4f806)

Review URL: https://codereview.chromium.org/1175083003.
diff --git a/fpdfsdk/src/javascript/JS_Context.cpp b/fpdfsdk/src/javascript/JS_Context.cpp
index 50f9f3c..11bb092 100644
--- a/fpdfsdk/src/javascript/JS_Context.cpp
+++ b/fpdfsdk/src/javascript/JS_Context.cpp
@@ -233,21 +233,20 @@
 	m_pEventHandler->OnField_Calculate(pSource, pTarget, Value, bRc);
 }
 
-void CJS_Context::OnField_Format(int nCommitKey, CPDF_FormField* pTarget, CFX_WideString& Value, FX_BOOL bWillCommit)
+void CJS_Context::OnField_Format(CPDF_FormField* pTarget, CFX_WideString& Value, FX_BOOL bWillCommit)
 {
-	ASSERT(m_pEventHandler != NULL);
-	m_pEventHandler->OnField_Format(nCommitKey, pTarget, Value, bWillCommit);
+    m_pEventHandler->OnField_Format(pTarget, Value, bWillCommit);
 }
 
 
-void CJS_Context::OnField_Keystroke(int nCommitKey, CFX_WideString& strChange, const CFX_WideString& strChangeEx,
+void CJS_Context::OnField_Keystroke(CFX_WideString& strChange, const CFX_WideString& strChangeEx,
 									FX_BOOL bKeyDown, FX_BOOL bModifier, int &nSelEnd,int &nSelStart,
 									FX_BOOL bShift, CPDF_FormField* pTarget, CFX_WideString& Value,
 									FX_BOOL bWillCommit, FX_BOOL bFieldFull, FX_BOOL& bRc)
 {
-	ASSERT(m_pEventHandler != NULL);
-	m_pEventHandler->OnField_Keystroke(nCommitKey, strChange, strChangeEx, bKeyDown,
-		bModifier, nSelEnd, nSelStart, bShift, pTarget, Value, bWillCommit, bFieldFull, bRc);
+    m_pEventHandler->OnField_Keystroke(
+        strChange, strChangeEx, bKeyDown, bModifier, nSelEnd, nSelStart,
+        bShift, pTarget, Value, bWillCommit, bFieldFull, bRc);
 }
 
 void CJS_Context::OnField_Validate(CFX_WideString& strChange,const CFX_WideString& strChangeEx,