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Load a file containing UTF-8 and other characters in the preview panel
and wait for the <webview> to load and display the file content [1].

Read the displayed text content and verify. Test is a PASS if the text
content of the <webview> contains 'їсти मुझे |∊☀✌✂♁ 🙂\n' and the right
file size "191 bytes" is shown in the quick view metadata box.

[1] Note: the test file must have a file extension that is known to be
text (an extension that files app deems to be text) to enable UTF-8 in
the preview panel <webview> renderer.

Test: browser_tests --gtest_filter="*openQuickViewUtf8Text"
Bug: 1064855
Change-Id: I7c07b7f98922a1bb93ea2b46c3bc93dd4ee9085d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426084
Auto-Submit: Noel Gordon <noel@chromium.org>
Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810033}