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/effects/gradients/SkTwoPointConicalGradient.cpp b/src/effects/gradients/SkTwoPointConicalGradient.cpp
index f56e7b4..d3fb4dd 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -484,7 +484,7 @@
 }
 
 void GrGLConical2Gradient::emitCode(GrGLShaderBuilder* builder,
-                                    const GrEffectStage& stage,
+                                    const GrEffectStage&,
                                     EffectKey key,
                                     const char* vertexCoords,
                                     const char* outputColor,