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/src/animator/SkDrawGroup.cpp b/src/animator/SkDrawGroup.cpp
index c569434..f4bc3c6 100644
--- a/src/animator/SkDrawGroup.cpp
+++ b/src/animator/SkDrawGroup.cpp
@@ -196,7 +196,7 @@
     return true;
 }
 
-bool SkGroup::ifCondition(SkAnimateMaker& maker, SkDrawable* drawable,
+bool SkGroup::ifCondition(SkAnimateMaker& maker, SkDrawable*,
         SkString& conditionString) {
     if (conditionString.size() == 0)
         return true;