Merge Widevine CDM-Side Test Changes

This is a combined merge of several small test changes in the
Widevine CDM repository:

http://go/wvgerrit/11252
  Chain CreateSession() Helpers in CDM Session Unit Test

http://go/wvgerrit/10931
  Increase URLRequest timeouts and tolerate 502's.

http://go/wvgerrit/10695
  Remove dead CHROMIUM_BUILD code in engine test.

Change-Id: I75a6c9509880a20c85e54cbd2fcbf34b101ce70e

libwvdrmengine/cdm/core/test/url_request.cpp

@@ -73,8 +73,14 @@ void ConcatenateChunkedResponse(const std::string http_response,
 namespace wvcdm {
 
 UrlRequest::UrlRequest(const std::string& url)
-    : is_connected_(false),
-      socket_(url) {
+    : is_connected_(false), socket_(url) {
+  Reconnect();
+}
+
+UrlRequest::~UrlRequest() {}
+
+void UrlRequest::Reconnect() {
+  socket_.CloseSocket();
   if (socket_.Connect(kConnectTimeoutMs)) {
     is_connected_ = true;
   } else {
@@ -83,8 +89,6 @@ UrlRequest::UrlRequest(const std::string& url)
   }
 }
 
-UrlRequest::~UrlRequest() {}
-
 bool UrlRequest::GetResponse(std::string* message) {
   std::string response;