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/DeferredCanvasTest.cpp b/tests/DeferredCanvasTest.cpp
index a052c2e..a752c83 100644
--- a/tests/DeferredCanvasTest.cpp
+++ b/tests/DeferredCanvasTest.cpp
@@ -246,7 +246,7 @@
     virtual void prepareForDraw() SK_OVERRIDE {
         fPrepareForDrawCount++;
     }
-    virtual void storageAllocatedForRecordingChanged(size_t size) SK_OVERRIDE {
+    virtual void storageAllocatedForRecordingChanged(size_t) SK_OVERRIDE {
         fStorageAllocatedChangedCount++;
     }
     virtual void flushedDrawCommands() SK_OVERRIDE {