Revert "[Sheriff] Disable the test"

This reverts commit af48c8e6.

Reason for revert: Test works now.

Original change's description:
> [Sheriff] Disable the test
> 
> Disable the failing test on Linux.
> 
> Bug=1108205
> TBR=miu@chromium.org
> 
> Change-Id: Ie388ca75a2fadce937d613994847217e7f9579fc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310271
> Reviewed-by: Hayato Ito <hayato@chromium.org>
> Commit-Queue: Hayato Ito <hayato@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#790745}

TBR=miu@chromium.org,hayato@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I4c43284f7d4a0fec1cd4c05fc375f1f4d406526b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2361023Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799428}

content/browser/media/capture/web_contents_video_capture_device_browsertest.cc

@@ -400,15 +400,8 @@ INSTANTIATE_TEST_SUITE_P(
 // whether the browser is running with software compositing or GPU-accelerated
 // compositing, whether the WebContents is visible/hidden or occluded/unoccluded
 // and whether the main document contains a cross-site iframe.
-
-// Fails on Linux only. http://crbug.com/1108205
-#if defined(OS_LINUX)
-#define MAYBE_CapturesContentChanges DISABLED_CapturesContentChanges
-#else
-#define MAYBE_CapturesContentChanges CapturesContentChanges
-#endif
 IN_PROC_BROWSER_TEST_P(WebContentsVideoCaptureDeviceBrowserTestP,
-                       MAYBE_CapturesContentChanges) {
+                       CapturesContentChanges) {
   SCOPED_TRACE(testing::Message()
                << "Test parameters: "
                << (IsSoftwareCompositingTest() ? "Software Compositing"