[sheriff] Disable DevToolsSanityTest.DevtoolsInDevTools on win

TBR=jianli@chromium.org
NOTRY=true

Bug: 1124981
Change-Id: I4d0bc93d601f69aeb0af506f67f86e274ba5734a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441277Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812218}

chrome/browser/devtools/devtools_sanity_browsertest.cc

@@ -1373,7 +1373,13 @@ IN_PROC_BROWSER_TEST_F(DevToolsExtensionTest, DevToolsExtensionInItself) {
 
 // Tests that a devtools (not a devtools extension) Iframe can be injected into
 // devtools.  http://crbug.com/570483
-IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, DevtoolsInDevTools) {
+// crbug.com/1124981: flaky on win
+#if defined(OS_WIN)
+#define MAYBE_DevtoolsInDevTools DISABLED_DevtoolsInDevTools
+#else
+#define MAYBE_DevtoolsInDevTools DevtoolsInDevTools
+#endif
+IN_PROC_BROWSER_TEST_F(DevToolsSanityTest, MAYBE_DevtoolsInDevTools) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   GURL devtools_url = GURL(chrome::kChromeUIDevToolsURL);