XFA: merge patch from CL 733693003, getting rid of more casts

Getting rid of more (FX_LPCWSTR) casts and fixing two bugs revealed by this.

Since casts to FX_LPCWSTR have been shown to hide bugs I tried removing
more of them, targeting those places where a cast was used to force a
conversion from CFX_WideString to FX_LPCWSTR, replacing these casts with
calls to the newly added .c_str() function. This revealed two places
where the cast was hiding a bug -- where ->c_str() was required instead!

This removes ~33 FX_LPCWSTR casts and there are ~31 left, many of which
will go away in some future change.

Also includes this change:

Removing unnecessary casts from wchar_t* to wchar_t*, by various names.

Original patch from Bruce Dawson(brucedawson@chromium.org)

TBR=bo_xu@foxitsoftware.com, tsepez@chromium.org

Review URL: https://codereview.chromium.org/811593007

1 files changed, 1 insertions, 1 deletions

diff --git a/core/src/fpdfapi/fpdf_font/fpdf_font.cpp b/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
index 36b6ce2b5b..dd646ca113 100644
--- a/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
+++ b/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
@@ -228,7 +228,7 @@ CFX_ByteString CPDF_Font::EncodeString(const CFX_WideString& str) const
     CFX_ByteString result;
     int src_len = str.GetLength();
     FX_LPSTR dest_buf = result.GetBuffer(src_len * 2);
-    FX_LPCWSTR src_buf = str;
+    FX_LPCWSTR src_buf = str.c_str();
     int dest_pos = 0;
     for (int src_pos = 0; src_pos < src_len; src_pos ++) {
         FX_DWORD charcode = CharCodeFromUnicode(src_buf[src_pos]);