Fix ref cnt'ing issue in GrProgramElement.

include/gpu/GrProgramElement.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrProgramElement_DEFINED
 #define GrProgramElement_DEFINED
 
@@ skipping 26 matching lines @@
     void ref() const {
         // Once the ref cnt reaches zero it should never be ref'ed again.
         SkASSERT(fRefCnt > 0);
         this->validate();
         ++fRefCnt;
     }
 
     void unref() const {
         this->validate();
         --fRefCnt;
-        if (0 == fRefCnt && 0 == fPendingExecutions) {
-            SkDELETE(this);
+        if (0 == fRefCnt) {
+            if (0 == fPendingExecutions) {
+                SkDELETE(this);
+            } else {
+                this->removeRefs();
+            }
         }
     }
 
     /**
      * Gets an id that is unique for this GrProgramElement object. This will never return 0.
      */
     uint32_t getUniqueID() const { return fUniqueID; }
 
     void validate() const {
 #ifdef SK_DEBUG
@@ skipping 14 matching lines @@
         fGpuResources.push_back(res);
     }
 
 private:
     static uint32_t CreateUniqueID();
 
     void convertRefToPendingExecution() const;
 
     void completedExecution() const;
 
+    void removeRefs() const;
+
     mutable int32_t fRefCnt;
     // Count of deferred executions not yet issued to the 3D API.
     mutable int32_t fPendingExecutions;
     uint32_t        fUniqueID;
 
     SkSTArray<4, const GrGpuResourceRef*, true> fGpuResources;
 
     // Only this class can access convertRefToPendingExecution() and completedExecution().
     template <typename T> friend class GrProgramElementRef;
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif