Mark ExtensionFileUtil.BackgroundScriptsMustExist as flaky on Windows.

chrome/common/extensions/extension_file_util_unittest.cc

Index: chrome/common/extensions/extension_file_util_unittest.cc
diff --git a/chrome/common/extensions/extension_file_util_unittest.cc b/chrome/common/extensions/extension_file_util_unittest.cc
index 0d6c66b210e89dc4269e223820aac20db43d674e..47eb52a841f4417e60edc7c77205cf3583ea61a1 100644
--- a/chrome/common/extensions/extension_file_util_unittest.cc
+++ b/chrome/common/extensions/extension_file_util_unittest.cc
@@ -318,7 +318,13 @@ TEST(ExtensionFileUtil, ValidateThemeUTF8) {
       error;
 }
 
-TEST(ExtensionFileUtil, BackgroundScriptsMustExist) {
+#if defined(OS_WIN)
+// This test is flaky on Windows. http://crbug.com/110279
+#define MAYBE_BackgroundScriptsMustExist FLAKY_BackgroundScriptsMustExist
+#else
+#define MAYBE_BackgroundScriptsMustExist BackgroundScriptsMustExist
+#endif
+TEST(ExtensionFileUtil, MAYBE_BackgroundScriptsMustExist) {
   ScopedTempDir temp;
   ASSERT_TRUE(temp.CreateUniqueTempDir());