Clean up GrGLSLFragmentProcessor-derived classes

In some other patches it was observed that many of the GrGLSLFragmentProcessor-derived classes needlessly pass a parameter to their constructors.

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1666773002

Review URL: https://codereview.chromium.org/1666773002
diff --git a/src/effects/SkDisplacementMapEffect.cpp b/src/effects/SkDisplacementMapEffect.cpp
index 41f1a6d..e861d58 100644
--- a/src/effects/SkDisplacementMapEffect.cpp
+++ b/src/effects/SkDisplacementMapEffect.cpp
@@ -313,9 +313,8 @@
 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 @@
     , fYChannelSelector(proc.cast<GrDisplacementMapEffect>().yChannelSelector()) {
 }
 
-GrGLDisplacementMapEffect::~GrGLDisplacementMapEffect() {
-}
-
 void GrGLDisplacementMapEffect::emitCode(EmitArgs& args) {
     const GrTextureDomain& domain = args.fFp.cast<GrDisplacementMapEffect>().domain();