real fix for textblob use after gpu free

src/gpu/GrTextBlobCache.cpp

Index: src/gpu/GrTextBlobCache.cpp
diff --git a/src/gpu/GrTextBlobCache.cpp b/src/gpu/GrTextBlobCache.cpp
index d66f432efbe28aa99c2b34a4def141af0d6a2d46..6f171779fc3cdbbb390f18aed573c88bed0ed082 100644
--- a/src/gpu/GrTextBlobCache.cpp
+++ b/src/gpu/GrTextBlobCache.cpp
@@ -42,7 +42,9 @@ GrAtlasTextContext::BitmapTextBlob* GrTextBlobCache::createBlob(int glyphCount,
 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();