sheriff: disable a CaptureScreenshotTest test on lacros

TBR=jrw@chromium.org

Bug: 1156767
Change-Id: I213f0d5776002d8ef6931ff564ad109e6e0bc052
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580299Reviewed-by: Dominique Fauteux-Chapleau <domfc@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834838}

content/browser/devtools/protocol/devtools_protocol_browsertest.cc

@@ -589,7 +589,8 @@ IN_PROC_BROWSER_TEST_F(CaptureScreenshotTest,
 // TODO(crbug.com/1150059) Android has a problem with changing scale.
 // TODO(crbug.com/1147911) Android Lollipop has a problem with capturing
 // screenshot.
-#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
+// TODO(crbug.com/1156767) Flaky on linux-lacros-tester-rel
+#if defined(OS_ANDROID) || defined(OS_CHROMEOS) || BUILDFLAG(IS_CHROMEOS_LACROS)
 #define MAYBE_CaptureScreenshotBeyondViewport_InnerScrollbarsAreShown \
   DISABLED_CaptureScreenshotBeyondViewport_InnerScrollbarsAreShown
 #else