Change "Sel" abbreviation to "Selection".

This CL changes SetSel() and GetSel() to SetSelection() and GetSelection()
in CFX_Edit and CPWL_EditCtrl, and SetEditSel() and GetEditSel() to
SetEditSelection() and GetEditSelection() in CPWL_ComboBox.

Change-Id: Idd984932bda139a04e99193e519756980b7d4397
Reviewed-on: https://pdfium-review.googlesource.com/8610
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/pdfwindow/cpwl_combo_box.cpp b/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
index d86c9db..e507633 100644
--- a/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
+++ b/fpdfsdk/pdfwindow/cpwl_combo_box.cpp
@@ -213,17 +213,18 @@
   m_nSelectItem = nItemIndex;
 }
 
-void CPWL_ComboBox::SetEditSel(int32_t nStartChar, int32_t nEndChar) {
+void CPWL_ComboBox::SetEditSelection(int32_t nStartChar, int32_t nEndChar) {
   if (m_pEdit)
-    m_pEdit->SetSel(nStartChar, nEndChar);
+    m_pEdit->SetSelection(nStartChar, nEndChar);
 }
 
-void CPWL_ComboBox::GetEditSel(int32_t& nStartChar, int32_t& nEndChar) const {
+void CPWL_ComboBox::GetEditSelection(int32_t& nStartChar,
+                                     int32_t& nEndChar) const {
   nStartChar = -1;
   nEndChar = -1;
 
   if (m_pEdit)
-    m_pEdit->GetSel(nStartChar, nEndChar);
+    m_pEdit->GetSelection(nStartChar, nEndChar);
 }
 
 void CPWL_ComboBox::Clear() {