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DumpAccTree testsuite: utf16 to utf8 conversion, get rid of utf16 version of AccessibilityTreeFormatterBase::WriteAttribute

Bug: 1115489
Change-Id: Ieeb4bcda323cdcc27e6a645ac3ab9742dc6e41f4
AX-Relnotes: n/a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364018Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Alexander Surkov <asurkov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#803088}