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Since ReportValidationError() already logs the description from its
|context| parameter, there is no need to pass the description separately.

Test: temporarily triggered the deserialization error and confirmed the error message has only one instance of interface name and method number

Change-Id: I813052bbaf4485d1fd269174b3a645535f548c7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2157721
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#761122}