RFC: use some in-memory state in SimpleCache to quickly cache-miss some CantConditionalize cases

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 62269b7952c8b89bc3d66dc773b42c22f62311fb..f1957d699110b480fd0a3ab203bc0f321462efe2 100644
--- a/net/http/http_cache_unittest.cc
+++ b/net/http/http_cache_unittest.cc
@@ -1328,7 +1328,7 @@ TEST(HttpCache, SimpleGET_PreserveRequestHeaders) {
   RunTransactionTest(cache.http_cache(), transaction);
 
   EXPECT_EQ(2, cache.network_layer()->transaction_count());
-  EXPECT_EQ(1, cache.disk_cache()->open_count());
+  EXPECT_EQ(0, cache.disk_cache()->open_count());
   EXPECT_EQ(1, cache.disk_cache()->create_count());
   RemoveMockTransaction(&transaction);
 }
@@ -4950,7 +4950,7 @@ TEST(HttpCache, GET_NoConditionalization) {
   // The last response was saved.
   RunTransactionTest(cache.http_cache(), transaction);
   EXPECT_EQ(3, cache.network_layer()->transaction_count());
-  EXPECT_EQ(2, cache.disk_cache()->open_count());
+  EXPECT_EQ(1, cache.disk_cache()->open_count());
   EXPECT_EQ(2, cache.disk_cache()->create_count());
 }
 
@@ -7384,7 +7384,7 @@ TEST(HttpCache, CacheControlNoCacheNormalLoad) {
   RunTransactionTest(cache.http_cache(), transaction);
 
   EXPECT_EQ(2, cache.network_layer()->transaction_count());
-  EXPECT_EQ(1, cache.disk_cache()->open_count());
+  EXPECT_EQ(0, cache.disk_cache()->open_count());
   EXPECT_EQ(1, cache.disk_cache()->create_count());
 
   disk_cache::Entry* entry;