Disable all the tests that are flaking more than 5% on Windows builders.

net/disk_cache/backend_unittest.cc

Index: net/disk_cache/backend_unittest.cc
diff --git a/net/disk_cache/backend_unittest.cc b/net/disk_cache/backend_unittest.cc
index f9df5bdd22efdff5ba9e5766f167c9d36f863125..1302e3b6a3b7d80e313e52a8def2ce320d618c8e 100644
--- a/net/disk_cache/backend_unittest.cc
+++ b/net/disk_cache/backend_unittest.cc
@@ -1783,11 +1783,23 @@ void DiskCacheBackendTest::BackendRecoverRemove() {
   ASSERT_TRUE(success_) << "remove_head4";
 }
 
-TEST_F(DiskCacheBackendTest, RecoverRemove) {
+#if defined(OS_WIN)
+// http://crbug.com/396392
+#define MAYBE_RecoverRemove DISABLED_RecoverRemove
+#else
+#define MAYBE_RecoverRemove RecoverRemove
+#endif
+TEST_F(DiskCacheBackendTest, MAYBE_RecoverRemove) {
   BackendRecoverRemove();
 }
 
-TEST_F(DiskCacheBackendTest, NewEvictionRecoverRemove) {
+#if defined(OS_WIN)
+// http://crbug.com/396392
+#define MAYBE_NewEvictionRecoverRemove DISABLED_NewEvictionRecoverRemove
+#else
+#define MAYBE_NewEvictionRecoverRemove NewEvictionRecoverRemove
+#endif
+TEST_F(DiskCacheBackendTest, MAYBE_NewEvictionRecoverRemove) {
   SetNewEviction();
   BackendRecoverRemove();
 }