Revert "Use Xvfb in isolated testing only if use_x11 is set"

This reverts commit 8a7be0714892c0c6360c45d0d602c119873b468e.

We've been seeing a problem with tab_capture_end2end_tests
taking too much time on linux_gpu_triggered_tests (over 1 hour
as opposed to below 30 seconds).

This was traced to wrong command on the isolate server,
as can be seen e.g. with [1] (good) and [2] (bad).

From builder history I was able to narrow down suspect revision range to just
cafcab99f5ea (good) [3] and 8a7be0714892 (bad) [4].

There are only two CLs in that range, https://codereview.chromium.org/841693004
and https://codereview.chromium.org/813363003 . First one is just a histogram
description change, while the latter changes *.isolate files, which is much more
suspect.

[1] https://isolateserver.appspot.com/browse?namespace=default-gzip&hash=13030c2ece3e5467ba858a978c685865181d32a6
[2] https://isolateserver.appspot.com/browse?namespace=default-gzip&hash=104dec9bff0fc701eac105a80d7d64be5b43b033
[3] http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_triggered_tests/builds/97223
[4] http://build.chromium.org/p/tryserver.chromium.gpu/builders/linux_gpu_triggered_tests/builds/97224

TBR=spang
BUG=440882

Review URL: https://codereview.chromium.org/843713002

Cr-Commit-Position: refs/heads/master@{#310464}

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