Tests : Unused parameters cleanup

I removed unused parameters in the tests wherever it was trivial to do so. I'm trying to get the easy ones out of the way before we get into more involved discussions around this.
Review URL: https://codereview.appspot.com/7394055

git-svn-id: http://skia.googlecode.com/svn/trunk@7891 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tests/EmptyPathTest.cpp b/tests/EmptyPathTest.cpp
index be7d529..5c054ec 100644
--- a/tests/EmptyPathTest.cpp
+++ b/tests/EmptyPathTest.cpp
@@ -104,7 +104,7 @@
 #define CX  (SkIntToScalar(DIMENSION) / 2)
 #define CY  (SkIntToScalar(DIMENSION) / 2)
 
-static void make_empty(SkPath* path) {}
+static void make_empty(SkPath*) {}
 static void make_M(SkPath* path) { path->moveTo(CX, CY); }
 static void make_MM(SkPath* path) { path->moveTo(CX, CY); path->moveTo(CX, CY); }
 static void make_MZM(SkPath* path) { path->moveTo(CX, CY); path->close(); path->moveTo(CX, CY); }