Fix QuicStreamFactoryFuzzer initialization with connection migration v2

Bug: 790997, 774622
Change-Id: I4b254e962d8aed0c10130b891d250980f412b088
Reviewed-on: https://chromium-review.googlesource.com/803620Reviewed-by: Buck Krasic <ckrasic@chromium.org>
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521135}

net/quic/chromium/quic_stream_factory_fuzzer.cc

@@ -116,20 +116,19 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   bool migrate_sessions_on_network_change = false;
   bool migrate_sessions_early = false;
   bool migrate_sessions_early_v2 = false;
-
-  bool migrate_sessions_on_network_change_v2 = data_provider.ConsumeBool();
-
-  if (migrate_sessions_on_network_change_v2) {
-    migrate_sessions_early_v2 = data_provider.ConsumeBool();
-  } else {
-    migrate_sessions_on_network_change = data_provider.ConsumeBool();
-    if (migrate_sessions_on_network_change)
-      migrate_sessions_early = data_provider.ConsumeBool();
+  bool migrate_sessions_on_network_change_v2 = false;
+
+  if (!close_sessions_on_ip_change) {
+    migrate_sessions_on_network_change_v2 = data_provider.ConsumeBool();
+    if (migrate_sessions_on_network_change_v2) {
+      migrate_sessions_early_v2 = data_provider.ConsumeBool();
+    } else {
+      migrate_sessions_on_network_change = data_provider.ConsumeBool();
+      if (migrate_sessions_on_network_change)
+        migrate_sessions_early = data_provider.ConsumeBool();
+    }
   }
 
-  if (migrate_sessions_on_network_change)
-    close_sessions_on_ip_change = false;
-
   std::unique_ptr<QuicStreamFactory> factory =
       std::make_unique<QuicStreamFactory>(
           env->net_log.net_log(), &host_resolver, env->ssl_config_service.get(),