Replace new with SkNEW in more effects classes.

http://codereview.appspot.com/6431052/



git-svn-id: http://skia.googlecode.com/svn/trunk@4727 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkGradientShader.cpp b/src/effects/SkGradientShader.cpp
index 8838e77..2b54bd1 100644
--- a/src/effects/SkGradientShader.cpp
+++ b/src/effects/SkGradientShader.cpp
@@ -728,7 +728,7 @@
     SkAutoMutexAcquire ama(gMutex);
 
     if (NULL == gCache) {
-        gCache = new SkBitmapCache(MAX_NUM_CACHED_GRADIENT_BITMAPS);
+        gCache = SkNEW_ARGS(SkBitmapCache, (MAX_NUM_CACHED_GRADIENT_BITMAPS));
     }
     size_t size = count * sizeof(int32_t);