* fix: always have head.headers available
* fix: use StringDataPipeProducer to write string
It can handle large strings correctly.
* fix: override RegisterNonNetworkSubresourceURLLoaderFactories
* fix: add dummy uninterceptProtocol implementation
* fix: jquery error handler can pass empty string
For some errors jquery would pass empty string in the error handler,
which makes tests pass when they should fail.
* chore: fix cpplint warnings
* fix: guard RegisterNonNetworkSubresourceURLLoaderFactories call
It may be called even when NetworkService is not enabled.
* test: disable protocol.interceptHttpProtocol test
237f74a01f