Mark ExtensionCrxInstaller.GrantScopes as flaky on Windows.

chrome/browser/extensions/crx_installer_browsertest.cc

Index: chrome/browser/extensions/crx_installer_browsertest.cc
diff --git a/chrome/browser/extensions/crx_installer_browsertest.cc b/chrome/browser/extensions/crx_installer_browsertest.cc
index ef41a066247abe72f12ea2e499134e6caa263b9f..8f3c1e0b1cca6055b33214dbce316376fc38660c 100644
--- a/chrome/browser/extensions/crx_installer_browsertest.cc
+++ b/chrome/browser/extensions/crx_installer_browsertest.cc
@@ -225,7 +225,12 @@ IN_PROC_BROWSER_TEST_F(
 
 // Tests that scopes are only granted if |record_oauth2_grant_| on the prompt is
 // true.
-IN_PROC_BROWSER_TEST_F(ExtensionCrxInstallerTest, GrantScopes) {
+#if defined(OS_WIN)
+#define MAYBE_GrantScopes FLAKY_GrantScopes
+#else
+#define MAYBE_GrantScopes GrantScopes
+#endif
+IN_PROC_BROWSER_TEST_F(ExtensionCrxInstallerTest, MAYBE_GrantScopes) {
   EXPECT_NO_FATAL_FAILURE(CheckHasEmptyScopesAfterInstall("browsertest/scopes",
                                                           true));
 }