[DevTools] Properly handle cache-only requests when cache is disabled

net/http/http_cache_unittest.cc

Index: net/http/http_cache_unittest.cc
diff --git a/net/http/http_cache_unittest.cc b/net/http/http_cache_unittest.cc
index d3e8fb6fd1403d64c516927a527503e83f376f87..62040a32a05453529d9a0786bb87096549092e85 100644
--- a/net/http/http_cache_unittest.cc
+++ b/net/http/http_cache_unittest.cc
@@ -6744,6 +6744,22 @@ TEST(HttpCache, WriteMetadata_Fail) {
   EXPECT_EQ(1, cache.disk_cache()->create_count());
 }
 
+TEST(HttpCache, InvalidLoadFlagCombination) {
+  MockHttpCache cache;
+
+  // Put the resource in the cache.
+  RunTransactionTest(cache.http_cache(), kSimpleGET_Transaction);
+
+  // Now try to fetch it again, but with a flag combination disallowing both
+  // cache and network access.
+  ScopedMockTransaction transaction(kSimpleGET_Transaction);
+  // DevTools relies on this combination of flags for "disable cache" mode
+  // when a resource is only supposed to be loaded from cache.
+  transaction.load_flags = LOAD_ONLY_FROM_CACHE | LOAD_BYPASS_CACHE;
+  transaction.return_code = ERR_CACHE_MISS;
+  RunTransactionTest(cache.http_cache(), transaction);
+}
+
 // Tests that we can read metadata after validating the entry and with READ mode
 // transactions.
 TEST(HttpCache, ReadMetadata) {