real fix for textblob use after gpu free

src/gpu/GrTextBlobCache.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTextBlobCache.h"
 
 static const int kVerticesPerGlyph = 4;
@@ skipping 24 matching lines @@
         SkNEW_PLACEMENT(&cacheBlob->fRuns[i], BitmapTextBlob::Run);
     }
     cacheBlob->fRunCount = runCount;
     cacheBlob->fPool = &fPool;
     return cacheBlob;
 }
 
 void GrTextBlobCache::freeAll() {
     SkTDynamicHash<BitmapTextBlob, BitmapTextBlob::Key>::Iter iter(&fCache);
     while (!iter.done()) {
-        (&(*iter))->unref();
+        BitmapTextBlob* blob = &(*iter);
+        fBlobList.remove(blob);
+        blob->unref();
         ++iter;
     }
     fCache.rewind();
 }