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, 2 insertions, 7 deletions

diff --git a/core/src/fxcrt/fx_xml_parser.cpp b/core/src/fxcrt/fx_xml_parser.cpp
index ea471d4792..8049a5587e 100644
--- a/core/src/fxcrt/fx_xml_parser.cpp
+++ b/core/src/fxcrt/fx_xml_parser.cpp
@@ -670,18 +670,13 @@ FX_BOOL CXML_Element::GetAttrValue(FX_BSTR name, CFX_WideString& attribute) cons
 {
     CFX_ByteStringC bsSpace, bsName;
     FX_XML_SplitQualifiedName(name, bsSpace, bsName);
-    const CFX_WideString* pValue = m_AttrMap.Lookup(bsSpace, bsName);
-    if (pValue) {
-        attribute = CFX_WideString((FX_LPCWSTR)*pValue, pValue->GetLength());
-        return TRUE;
-    }
-    return FALSE;
+    return GetAttrValue(bsSpace, bsName, attribute);
 }
 FX_BOOL CXML_Element::GetAttrValue(FX_BSTR space, FX_BSTR name, CFX_WideString& attribute) const
 {
     const CFX_WideString* pValue = m_AttrMap.Lookup(space, name);
     if (pValue) {
-        attribute = CFX_WideString((FX_LPCWSTR)*pValue, pValue->GetLength());
+        attribute = *pValue;
         return TRUE;
     }
     return FALSE;