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/fpdfdoc/doc_form.cpp b/core/src/fpdfdoc/doc_form.cpp
index 821b9981b8..6b7e6bf2d6 100644
--- a/core/src/fpdfdoc/doc_form.cpp
+++ b/core/src/fpdfdoc/doc_form.cpp
@@ -161,7 +161,7 @@ CFieldTree::_Node *CFieldTree::_Lookup(_Node *pParent, const CFX_WideString &sho
     for (int i = 0; i < ptr_array.GetSize(); i ++) {
         _Node *pNode = (_Node *)ptr_array[i];
         if (pNode->short_name.GetLength() == short_name.GetLength() &&
-                FXSYS_memcmp32((FX_LPCWSTR)pNode->short_name, (FX_LPCWSTR)short_name, short_name.GetLength()*sizeof(FX_WCHAR)) == 0) {
+                FXSYS_memcmp32(pNode->short_name.c_str(), short_name.c_str(), short_name.GetLength()*sizeof(FX_WCHAR)) == 0) {
             return pNode;
         }
     }