Adds cache lock timeout handling after finishing headers phase.

net/http/mock_http_cache.cc

Index: net/http/mock_http_cache.cc
diff --git a/net/http/mock_http_cache.cc b/net/http/mock_http_cache.cc
index e676122b53f4c77492d3676dac08bf517b0220dd..5363d3af29dd0067ce58b9cd9489b40f2b545b16 100644
--- a/net/http/mock_http_cache.cc
+++ b/net/http/mock_http_cache.cc
@@ -586,7 +586,11 @@ int MockHttpCache::CreateTransaction(std::unique_ptr<HttpTransaction>* trans) {
 }
 
 void MockHttpCache::SimulateCacheLockTimeout() {
-  http_cache_.SimulateCacheLockTimeout();
+  http_cache_.SimulateCacheLockTimeoutForTesting();
+}
+
+void MockHttpCache::SimulateCacheLockTimeoutAfterHeaders() {
+  http_cache_.SimulateCacheLockTimeoutAfterHeadersForTesting();
 }
 
 void MockHttpCache::FailConditionalizations() {