[MKLDNN] Speech Commands example doesn't work

[Christywl]

Test Env:
Chromium Version: nightly build 75.0.3739.0 (79fdab0)
Platform: Linux/Windows/macOS

Expected Result:
Speech Commands should work.

Actual Result:
Speech Commands example doesn't work.

[16448:16563:0816/101910.362430:ERROR:compilation_delegate_mkl_dnn.cc(1098)] [MKLDNN] failed to init pooling descriptor 3

How to Reproduce:

1. Launch chromium and visit https://intel.github.io/webml-polyfill/examples/speech_commands/
2. Select FAST_SINGLE_ANSWER
3. Select KWS CNN model