Third try at landing gRPC refactoring. Previous issue failed on the waterfall

components/cronet/ios/test/start_cronet.h

Index: components/cronet/ios/test/start_cronet.h
diff --git a/components/cronet/ios/test/cronet_test_runner.mm b/components/cronet/ios/test/start_cronet.h
similarity index 43%
copy from components/cronet/ios/test/cronet_test_runner.mm
copy to components/cronet/ios/test/start_cronet.h
index 2272531cdc0df3512b7f74022ce41886aa4ad96f..e965c3e20c81b8a6c125a09d2d06b8e96060fbd4 100644
--- a/components/cronet/ios/test/cronet_test_runner.mm
+++ b/components/cronet/ios/test/start_cronet.h
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "testing/gtest/include/gtest/gtest.h"
-#include "testing/gtest_mac.h"
+namespace cronet {
 
-int main(int argc, char* argv[]) {
-  ::testing::InitGoogleTest(&argc, argv);
-  return RUN_ALL_TESTS();
-}
+// Starts Cronet if it hasn't already been started. Will always update Cronet
+// to point test.example.com" to "localhost:|port|".
+void StartCronetIfNecessary(int port);
+
+}  // namespace cronet