Clean up GrGLSLFragmentProcessor-derived classes

src/effects/SkDisplacementMapEffect.cpp

Index: src/effects/SkDisplacementMapEffect.cpp
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 41f1a6db71678fa8b0cb1afb6b4ffaafc53522b5..e861d5836fee966ba1380539e2638ae542e629b9 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -313,9 +313,8 @@ void SkDisplacementMapEffect::toString(SkString* str) const {
 class GrGLDisplacementMapEffect : public GrGLSLFragmentProcessor {
 public:
     GrGLDisplacementMapEffect(const GrProcessor&);
-    virtual ~GrGLDisplacementMapEffect();
 
-    virtual void emitCode(EmitArgs&) override;
+    void emitCode(EmitArgs&) override;
 
     static inline void GenKey(const GrProcessor&, const GrGLSLCaps&, GrProcessorKeyBuilder*);
 
@@ -548,9 +547,6 @@ GrGLDisplacementMapEffect::GrGLDisplacementMapEffect(const GrProcessor& proc)
     , fYChannelSelector(proc.cast<GrDisplacementMapEffect>().yChannelSelector()) {
 }
 
-GrGLDisplacementMapEffect::~GrGLDisplacementMapEffect() {
-}
-
 void GrGLDisplacementMapEffect::emitCode(EmitArgs& args) {
     const GrTextureDomain& domain = args.fFp.cast<GrDisplacementMapEffect>().domain();