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/GrConfigConversionEffect.cpp b/src/gpu/effects/GrConfigConversionEffect.cpp
index f2c5d09..5cc05e2 100644
--- a/src/gpu/effects/GrConfigConversionEffect.cpp
+++ b/src/gpu/effects/GrConfigConversionEffect.cpp
@@ -137,7 +137,7 @@
 GR_DEFINE_EFFECT_TEST(GrConfigConversionEffect);
 
 GrEffectRef* GrConfigConversionEffect::TestCreate(SkMWCRandom* random,
-                                                  GrContext* context,
+                                                  GrContext*,
                                                   GrTexture* textures[]) {
     PMConversion pmConv = static_cast<PMConversion>(random->nextULessThan(kPMConversionCnt));
     bool swapRB;