Remove in-out param from OnCharWithExit

This CL splits the OnCharWithExit method into IsChar and OnCharNotify
and changes the in-out parameter to a return.

Change-Id: Ifd5aafc6facf7a4d9acfe56118331b3935691965
Reviewed-on: https://pdfium-review.googlesource.com/7335
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>
diff --git a/fpdfsdk/pdfwindow/cpwl_combo_box.cpp b/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
index acebfbe..20cbcd3 100644
--- a/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
+++ b/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
@@ -89,17 +89,17 @@
   return bExit;
 }
 
-bool CPWL_CBListBox::OnCharWithExit(uint16_t nChar,
-                                    bool& bExit,
-                                    uint32_t nFlag) {
-  if (!m_pList->OnChar(nChar, IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag)))
-    return false;
+bool CPWL_CBListBox::IsChar(uint16_t nChar, uint32_t nFlag) const {
+  return m_pList->OnChar(nChar, IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
+}
+
+bool CPWL_CBListBox::OnCharNotify(uint16_t nChar, uint32_t nFlag) {
   if (CPWL_ComboBox* pComboBox = (CPWL_ComboBox*)GetParentWindow())
     pComboBox->SetSelectText();
 
+  bool bExit = false;
   OnNotifySelChanged(true, bExit, nFlag);
-
-  return true;
+  return bExit;
 }
 
 void CPWL_CBButton::GetThisAppearanceStream(std::ostringstream* psAppStream) {
@@ -530,8 +530,9 @@
       return false;
   }
 #endif  // PDF_ENABLE_XFA
-  bool bExit = false;
-  return m_pList->OnCharWithExit(nChar, bExit, nFlag) ? bExit : false;
+  if (!m_pList->IsChar(nChar, nFlag))
+    return false;
+  return m_pList->OnCharNotify(nChar, nFlag);
 }
 
 void CPWL_ComboBox::NotifyLButtonDown(CPWL_Wnd* child, const CFX_PointF& pos) {