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/SkBlurDrawLooper.cpp b/src/effects/SkBlurDrawLooper.cpp
index b5a8754..9585214 100644
--- a/src/effects/SkBlurDrawLooper.cpp
+++ b/src/effects/SkBlurDrawLooper.cpp
@@ -74,7 +74,7 @@
     buffer.writeUInt(fBlurFlags);
 }
 
-void SkBlurDrawLooper::init(SkCanvas* canvas) {
+void SkBlurDrawLooper::init(SkCanvas*) {
     fState = kBeforeEdge;
 }