Sends signed provisioning request as query string instead of payload.

Bug: 8790775

Merge of https://widevine-internal-review.googlesource.com/#/c/5381/
from the Widevine CDM repository.

Change-Id: I749303eee8162f37982f6dd5d83b6cf254b96847

libwvdrmengine/cdm/test/request_license_test.cpp

@@ -115,14 +115,14 @@ class WvCdmRequestLicenseTest : public testing::Test {
 
   // posts a request and extracts the drm message from the response
   std::string GetCertRequestResponse(const std::string& server_url,
-                                    int expected_response) {
+                                     int expected_response) {
     UrlRequest url_request(server_url, g_port);
 
     if (!url_request.is_connected()) {
       return "";
     }
 
-    url_request.PostCertRequest(key_msg_);
+    url_request.PostCertRequestInQueryString(key_msg_);
     std::string response;
     int resp_bytes = url_request.GetResponse(response);
     if (resp_bytes) {