Reduce usage of operator LPCWSTR from CFX_WideString().

core/src/fpdftext/fpdf_text_int.cpp

Index: core/src/fpdftext/fpdf_text_int.cpp
diff --git a/core/src/fpdftext/fpdf_text_int.cpp b/core/src/fpdftext/fpdf_text_int.cpp
index 2b9a079006d60c64dc91b273f75f656b19b69876..be92c86d609e3202dc35ddc446636b0b15fdc901 100644
--- a/core/src/fpdftext/fpdf_text_int.cpp
+++ b/core/src/fpdftext/fpdf_text_int.cpp
@@ -2379,7 +2379,7 @@ FX_BOOL CPDF_TextPageFind::FindNext()
             continue;
         }
         int endIndex;
-        nResultPos = m_strText.Find(csWord, nStartPos);
+        nResultPos = m_strText.Find(csWord.c_str(), nStartPos);
         if (nResultPos == -1) {
             m_IsFind = FALSE;
             return m_IsFind;
@@ -2496,7 +2496,7 @@ void CPDF_TextPageFind::ExtractFindWhat(const CFX_WideString& findwhat)
     int index = 0;
     while(1) {
         CFX_WideString csWord = TEXT_EMPTY;
-        int ret = ExtractSubString(csWord, findwhat, index, TEXT_BLANK_CHAR);
+        int ret = ExtractSubString(csWord, findwhat.c_str(), index, TEXT_BLANK_CHAR);
         if(csWord.IsEmpty()) {
             if(ret) {
                 m_csFindWhatArray.Add(CFX_WideString(L""));