[Cronet] Add back prior UrlResponseInfoImpl()

This constructor is deprecated but apparently called by many Cronet embedders.
Proguard should remove this in production code.

R=mef@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester
Change-Id: I1e5d76a8c60980f06896c4e7531ba6a702f5942f
Reviewed-on: https://chromium-review.googlesource.com/976261Reviewed-by: Misha Efimov <mef@chromium.org>
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545180}

components/cronet/android/java/src/org/chromium/net/impl/UrlResponseInfoImpl.java

@@ -95,6 +95,17 @@ public final class UrlResponseInfoImpl extends UrlResponseInfo {
         mReceivedByteCount = new AtomicLong(receivedByteCount);
     }
 
+    /**
+     * Constructor for backwards compatibility.  See main constructor above for more info.
+     */
+    @Deprecated
+    public UrlResponseInfoImpl(List<String> urlChain, int httpStatusCode, String httpStatusText,
+            List<Map.Entry<String, String>> allHeadersList, boolean wasCached,
+            String negotiatedProtocol, String proxyServer) {
+        this(urlChain, httpStatusCode, httpStatusText, allHeadersList, wasCached,
+                negotiatedProtocol, proxyServer, 0);
+    }
+
     @Override
     public String getUrl() {
         return mResponseInfoUrlChain.get(mResponseInfoUrlChain.size() - 1);