Removed unused parameters

I removed unused parameters wherever it was trivial to do so.
Review URL: https://codereview.chromium.org/12469002

git-svn-id: http://skia.googlecode.com/svn/trunk@8068 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/effects/GrConvolutionEffect.h b/src/gpu/effects/GrConvolutionEffect.h
index b2b24e5..e4faa94 100644
--- a/src/gpu/effects/GrConvolutionEffect.h
+++ b/src/gpu/effects/GrConvolutionEffect.h
@@ -52,7 +52,7 @@
 
     virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE;
 
-    virtual void getConstantColorComponents(GrColor* color, uint32_t* validFlags) const {
+    virtual void getConstantColorComponents(GrColor*, uint32_t* validFlags) const {
         // If the texture was opaque we could know that the output color if we knew the sum of the
         // kernel values.
         *validFlags = 0;