Revert "Disable rendering.desktop/camera_to_webgl on linux"

This reverts commit 473f628e.

Reason for revert: causing patch was reverted already.

Original change's description:
> Disable rendering.desktop/camera_to_webgl on linux
> 
> Disabling failing perf test rendering.desktop/camera_to_webgl on Linux.
> 
> TBR=crouleau@chromium.org
> NOTRY=true
> 
> Bug: 1026788
> Change-Id: I33855a286f0391630291ecfd8a78d31de53a61cb
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1925262
> Commit-Queue: John Chen <johnchen@chromium.org>
> Reviewed-by: John Chen <johnchen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#717246}

TBR=crouleau@chromium.org,johnchen@chromium.org

Change-Id: Ide5b5a4aa9f0e5e2a03a12b1765cbe81909d945b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1026788
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1928198Reviewed-by: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717762}

tools/perf/expectations.config

@@ -222,7 +222,6 @@ crbug.com/755556 [ mac ] rendering.desktop/mix_blend_mode_animation_difference [
 crbug.com/755556 [ mac ] rendering.desktop/mix_blend_mode_animation_hue [ Skip ]
 crbug.com/1017244 [ desktop ] rendering.desktop/youtube_2018 [ Skip ]
 crbug.com/1017244 [ desktop ] rendering.desktop/youtube_pinch_2018 [ Skip ]
-crbug.com/1026788 [ linux ] rendering.desktop/camera_to_webgl [ Skip ]
 
 # Benchmark: rendering.mobile
 crbug.com/785485 [ android-webview ] rendering.mobile/kevs_3d [ Skip ]