Merge pull request cocos2d#2778 from dingpinglv/Iss2698_namespace

Removed the unused function from cc.Sprite.

Author: dingpinglv

cocos2d/clipping-nodes/CCClippingNodeCanvasRenderCmd.js

@@ -104,7 +104,7 @@
          if(!stencil)
             return;
         var node = this._node;
-        if(stencil._renderCmd && stencil._renderCmd._blendFuncStr)
+        if(stencil._renderCmd && stencil._renderCmd._blendFuncStr)          //it is a hack way.
             stencil._renderCmd._blendFuncStr = (node.inverted ? "destination-out" : "destination-in");
 
         if(!stencil._children)

cocos2d/core/sprites/CCSpriteCanvasRenderCmd.js

@@ -46,11 +46,6 @@
 
     proto._init = function () {};
 
-    proto._setBlendFuncStr = function(compositeOperation){
-        //a hack function for clippingNode
-         this._blendFuncStr = compositeOperation;
-    };
-
     proto.setDirtyRecursively = function (value) {};
 
     proto._resetForBatchNode = function () {};