Replace some calls to Release() with direct delete, part 1.

xfa/fde/css/fde_cssstyleselector.h

Index: xfa/fde/css/fde_cssstyleselector.h
diff --git a/xfa/fde/css/fde_cssstyleselector.h b/xfa/fde/css/fde_cssstyleselector.h
index 790149c596e2882b0e36fd9d9c28010f84369e31..cb54aaed7fbb78e892d8bdfd0ccacf879cd6c2a7 100644
--- a/xfa/fde/css/fde_cssstyleselector.h
+++ b/xfa/fde/css/fde_cssstyleselector.h
@@ -93,9 +93,7 @@ class CFDE_CSSRuleCollection : public CFX_Target {
 class CFDE_CSSStyleSelector : public CFX_Target {
  public:
   CFDE_CSSStyleSelector();
-  ~CFDE_CSSStyleSelector();
-
-  void Release() { delete this; }
+  ~CFDE_CSSStyleSelector() override;
 
   void SetFontMgr(IFX_FontMgr* pFontMgr);
   void SetDefFontSize(FX_FLOAT fFontSize);