attempt to fix bug 5313580

the working theory here is that a Surface object has become non-promotable
because it lost its last reference; later Surface::readFromParcel is called
the previous surface is found in the cache, but can't be promoted. this causes
a new Surface object to be created which will promptly try to connect to the
CPU_API -- this in turn will fail because the previous (now dead) surface is
still connected.

To fix this, we make sure to disconnect from the SurfaceTexture when
Surface[TextureClient] is destroyed.

Change-Id: I422234868a05d7b7d283e9d5a85f7ab79e65d8a9
diff --git a/include/gui/SurfaceTextureClient.h b/include/gui/SurfaceTextureClient.h
index 57f9e15..971a1b8 100644
--- a/include/gui/SurfaceTextureClient.h
+++ b/include/gui/SurfaceTextureClient.h
@@ -40,6 +40,7 @@
 
 protected:
     SurfaceTextureClient();
+    virtual ~SurfaceTextureClient();
     void setISurfaceTexture(const sp<ISurfaceTexture>& surfaceTexture);
 
 private: