Speculative fix for flaky leaks in gcm_unit_tests.

This CL tries to fix the test flakiness in gcm_unit_tests by using
the mock NetworkChangeNotifier in tests, which avoids receiving real
network status changes.

Bug: 906769
Change-Id: I08227a6f303328fe2f44cecc84c0ea64bd145415
Tbr: rmcelrath@chromium.org
Tbr: dimich@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1343592
Reviewed-by: Yuta Kitamura <yutak@chromium.org>
Commit-Queue: Yuta Kitamura <yutak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609632}

google_apis/gcm/base/socket_stream_unittest.cc

@@ -91,6 +91,7 @@ class GCMSocketStreamTest : public testing::Test {
 
   // net:: components.
   net::AddressList address_list_;
+  std::unique_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   std::unique_ptr<network::NetworkService> network_service_;
   network::mojom::NetworkContextPtr network_context_ptr_;
   net::MockClientSocketFactory socket_factory_;
@@ -104,6 +105,7 @@ class GCMSocketStreamTest : public testing::Test {
 GCMSocketStreamTest::GCMSocketStreamTest()
     : scoped_task_environment_(
           base::test::ScopedTaskEnvironment::MainThreadType::IO),
+      network_change_notifier_(net::NetworkChangeNotifier::CreateMock()),
       network_service_(network::NetworkService::CreateForTesting()),
       url_request_context_(true /* delay_initialization */) {
   address_list_ = net::AddressList::CreateFromIPAddress(

google_apis/gcm/engine/connection_factory_impl_unittest.cc

@@ -304,6 +304,7 @@ class ConnectionFactoryImplTest
   std::unique_ptr<base::RunLoop> run_loop_;
 
   GURL connected_server_;
+  std::unique_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   std::unique_ptr<network::NetworkService> network_service_;
   network::mojom::NetworkContextPtr network_context_ptr_;
   std::unique_ptr<network::NetworkContext> network_context_;
@@ -320,6 +321,7 @@ ConnectionFactoryImplTest::ConnectionFactoryImplTest()
                base::Bind(&ConnectionFactoryImplTest::ConnectionsComplete,
                           base::Unretained(this))),
       run_loop_(new base::RunLoop()),
+      network_change_notifier_(net::NetworkChangeNotifier::CreateMock()),
       network_service_(network::NetworkService::CreateForTesting()) {
   network::mojom::NetworkContextParamsPtr params =
       network::mojom::NetworkContextParams::New();

google_apis/gcm/engine/connection_handler_impl_unittest.cc

@@ -191,6 +191,7 @@ class GCMConnectionHandlerImplTest : public testing::Test {
   net::AddressList address_list_;
   base::test::ScopedTaskEnvironment scoped_task_environment_;
   std::unique_ptr<base::RunLoop> run_loop_;
+  std::unique_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   std::unique_ptr<network::NetworkService> network_service_;
   network::mojom::NetworkContextPtr network_context_ptr_;
   net::MockClientSocketFactory socket_factory_;
@@ -205,6 +206,7 @@ GCMConnectionHandlerImplTest::GCMConnectionHandlerImplTest()
     : last_error_(0),
       scoped_task_environment_(
           base::test::ScopedTaskEnvironment::MainThreadType::IO),
+      network_change_notifier_(net::NetworkChangeNotifier::CreateMock()),
       network_service_(network::NetworkService::CreateForTesting()),
       url_request_context_(true /* delay_initialization */) {
   address_list_ = net::AddressList::CreateFromIPAddress(