Fixes the cache lock issue.

net/http/http_transaction_test_util.cc

Index: net/http/http_transaction_test_util.cc
diff --git a/net/http/http_transaction_test_util.cc b/net/http/http_transaction_test_util.cc
index a5b57461df5a2e49568fa045bc285f9d01e006bc..0c422c82505e9c186e84800496ecae4843e7feb7 100644
--- a/net/http/http_transaction_test_util.cc
+++ b/net/http/http_transaction_test_util.cc
@@ -5,8 +5,10 @@
 #include "net/http/http_transaction_test_util.h"
 
 #include <algorithm>
+#include <memory>
 #include <unordered_map>
 #include <utility>
+#include <vector>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ -34,6 +36,7 @@
 namespace net {
 
 namespace {
+
 using MockTransactionMap =
     std::unordered_map<std::string, const MockTransaction*>;
 static MockTransactionMap mock_transactions;
@@ -149,6 +152,9 @@ MockHttpRequest::MockHttpRequest(const MockTransaction& t) {
   load_flags = t.load_flags;
 }
 
+Context::Context() : result(ERR_IO_PENDING) {}
+Context::~Context() {}
+
 //-----------------------------------------------------------------------------
 
 // static
@@ -488,7 +494,7 @@ int MockNetworkTransaction::ResumeNetworkStart() {
 
 void MockNetworkTransaction::GetConnectionAttempts(
     ConnectionAttempts* out) const {
-  NOTIMPLEMENTED();
+  return;
 }
 
 void MockNetworkTransaction::CallbackLater(const CompletionCallback& callback,