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Before this CL we didn't stop appending data for mulitpart images
even after there was an decode error. This doesn't align the assumption
the base class has. The base class, Resource, doesn't expect calling
AppendData() when there was an error. We should cancel the parser when
there is a decode error so that we don't append data after the error.

Bug: 813485
Change-Id: I40112e11bf1d7d1c84e2794c81bbaf178207496f
Reviewed-on: https://chromium-review.googlesource.com/923668Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537689}