style nit cleanups. e.g. remove 'virtual' on override declarations

src/core/SkXfermode_proccoeff.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #ifndef SkXfermode_proccoeff_DEFINED
 #define SkXfermode_proccoeff_DEFINED
 
 #include "SkXfermode.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 
 struct ProcCoeff {
     SkXfermodeProc      fProc;
     SkXfermode::Coeff   fSC;
     SkXfermode::Coeff   fDC;
 };
 
 #define CANNOT_USE_COEFF    SkXfermode::Coeff(-1)
 
 class SK_API SkProcCoeffXfermode : public SkXfermode {
 public:
     SkProcCoeffXfermode(const ProcCoeff& rec, Mode mode) {
         fMode = mode;
         fProc = rec.fProc;
         // these may be valid, or may be CANNOT_USE_COEFF
         fSrcCoeff = rec.fSC;
         fDstCoeff = rec.fDC;
     }
 
-    virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
-                        const SkAlpha aa[]) const override;
-    virtual void xfer16(uint16_t dst[], const SkPMColor src[], int count,
-                        const SkAlpha aa[]) const override;
-    virtual void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
-                        const SkAlpha aa[]) const override;
+    void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
+                const SkAlpha aa[]) const override;
+    void xfer16(uint16_t dst[], const SkPMColor src[], int count,
+                const SkAlpha aa[]) const override;
+    void xferA8(SkAlpha dst[], const SkPMColor src[], int count,
+                const SkAlpha aa[]) const override;
 
     bool asMode(Mode* mode) const override;
 
     bool supportsCoverageAsAlpha() const override;
 
     bool isOpaque(SkXfermode::SrcColorOpacity opacityType) const override;
 
 #if SK_SUPPORT_GPU
-    virtual bool asFragmentProcessor(GrFragmentProcessor**,
-                                     GrTexture* background) const override;
+    bool asFragmentProcessor(GrFragmentProcessor**, GrTexture* background) const override;
 
-    virtual bool asXPFactory(GrXPFactory**) const override;
+    bool asXPFactory(GrXPFactory**) const override;
 #endif
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkProcCoeffXfermode)
 
 protected:
     void flatten(SkWriteBuffer& buffer) const override;
 
     Mode getMode() const { return fMode; }
 
     SkXfermodeProc getProc() const { return fProc; }
 
 private:
     SkXfermodeProc  fProc;
     Mode            fMode;
     Coeff           fSrcCoeff, fDstCoeff;
 
     friend class SkXfermode;
 
     typedef SkXfermode INHERITED;
 };
 
 #endif // #ifndef SkXfermode_proccoeff_DEFINED