CronetClient didn't setup proper method for requests

[AlexV525]

(downstream cfug/dio#2035)

When making requests with the DELETE method, POST was sent instead. This is caused by the missing request method setup before we start the builder.

http/pkgs/cronet_http/lib/src/cronet_client.dart

Lines 315 to 320 in 9fb4cfa

	final builder = engine.newUrlRequestBuilder(
	request.url.toString().toJString(),
	jb.UrlRequestCallbackProxy.new1(
	_urlRequestCallbacks(request, responseCompleter)),
	_executor,
	);

Instead, we can write:

  final builder = engine.newUrlRequestBuilder(
    request.url.toString().toJString(),
    jb.UrlRequestCallbackProxy.new1(
        _urlRequestCallbacks(request, responseCompleter)),
    _executor,
- );
+ ).setHttpMethod(request.method.toJString());