[Sherriff] Disable AXPlatformNodeTextRangeProviderWinBrowserTest.IFrameSelect

TBR=nektar

Bug: 1132248
Change-Id: I63f10d7e3e30022f20fec86b35e5f4cb66d4121e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431504Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810605}

content/browser/accessibility/ax_platform_node_textrangeprovider_win_browsertest.cc

@@ -2566,8 +2566,10 @@ IN_PROC_BROWSER_TEST_F(
   AssertMoveByUnitForMarkup(TextUnit_Format, html_markup, format_units);
 }
 
+// Flaky.
+// TODO(https://crbug.com/1132248): Re-enable.
 IN_PROC_BROWSER_TEST_F(AXPlatformNodeTextRangeProviderWinBrowserTest,
-                       IframeSelect) {
+                       DISABLED_IframeSelect) {
   LoadInitialAccessibilityTreeFromHtmlFilePath(
       "/accessibility/html/iframe-cross-process.html");