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This reverts commit 5bc5a4c5.

Reason for revert: Test passes only flakily on Linux

Original change's description:
> Connect Linux Font Unique Name Lookup to Blink
> 
> Provide a new subclass for font unique name lookup for Linux. Connect
> via WebSandboxSupport to FontLoader which provides the out of process
> fontconfig calls for us. Tested by content_browsertests with a DevTools
> based test checking used fonts. This test was previously active on
> Android and is enabled for Linux in this CL.
> 
> Bug: 880832
> Change-Id: I04d72fc1cfcfa55a01a9877ac8a3a45dbff38771
> Reviewed-on: https://chromium-review.googlesource.com/1206337
> Commit-Queue: Dominik Röttsches <drott@chromium.org>
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Reviewed-by: Emil A Eklund <eae@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#589482}

TBR=dgozman@chromium.org,eae@chromium.org,drott@chromium.org

Change-Id: I811960048b2f37130e4be4cb9c693dc90040f30d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 880832
Reviewed-on: https://chromium-review.googlesource.com/1213168Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589500}