Removed unused parameters

I removed unused parameters wherever it was trivial to do so.
Review URL: https://codereview.chromium.org/12772003

git-svn-id: http://skia.googlecode.com/svn/trunk@8103 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleEffects.cpp b/samplecode/SampleEffects.cpp
index 15ad809..1169725 100644
--- a/samplecode/SampleEffects.cpp
+++ b/samplecode/SampleEffects.cpp
@@ -18,7 +18,7 @@
 //#define COLOR 0xFFFF8844
 #define COLOR 0xFF888888
 
-static void paint_proc0(SkPaint* paint) {
+static void paint_proc0(SkPaint*) {
 }
 
 static void paint_proc1(SkPaint* paint) {