XFA: Fix two minor build errors on Windows

- remove unused local variable rtArrow in CFWL_WidgetTP::DrawArrow
- remove ~ in class IFX_FontMgr

BUG=none
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1416673005 .
diff --git a/xfa/src/fgas/include/fx_fnt.h b/xfa/src/fgas/include/fx_fnt.h
index 4a10ee3..4d60af2 100644
--- a/xfa/src/fgas/include/fx_fnt.h
+++ b/xfa/src/fgas/include/fx_fnt.h
@@ -138,7 +138,7 @@
   static IFX_FontMgr* Create(FX_LPEnumAllFonts pEnumerator,

                              FX_LPMatchFont pMatcher = NULL,

                              void* pUserData = NULL);

-  ~virtual ~IFX_FontMgr() {}

+  virtual ~IFX_FontMgr() {}

   virtual void Release() = 0;

   virtual IFX_Font* GetDefFontByCodePage(

       FX_WORD wCodePage,

diff --git a/xfa/src/fwl/src/theme/widgettp.cpp b/xfa/src/fwl/src/theme/widgettp.cpp
index bd21b4e..49b8f21 100644
--- a/xfa/src/fwl/src/theme/widgettp.cpp
+++ b/xfa/src/fwl/src/theme/widgettp.cpp
@@ -557,7 +557,6 @@
                               FWLTHEME_DIRECTION eDict,

                               FX_ARGB argSign,

                               CFX_Matrix* pMatrix) {

-  CFX_RectF rtArrow(*pRect);

   FX_BOOL bVert =

       (eDict == FWLTHEME_DIRECTION_Up || eDict == FWLTHEME_DIRECTION_Down);

   FX_FLOAT fLeft =