[Cronet] Remove CronetEngine.Builder JSON serial/deserialization APIs

components/cronet/android/api/src/org/chromium/net/CronetEngine.java

Index: components/cronet/android/api/src/org/chromium/net/CronetEngine.java
diff --git a/components/cronet/android/api/src/org/chromium/net/CronetEngine.java b/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
index 9316a7c0e25e02ce30f26e93e09645620fe4e0a6..aae436c7040084ead7a06176e571860d35235d47 100644
--- a/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
+++ b/components/cronet/android/api/src/org/chromium/net/CronetEngine.java
@@ -53,19 +53,6 @@ public abstract class CronetEngine {
         }
 
         /**
-         * Creates a config from a JSON string, which was serialized using
-         * {@link #toString}.
-         *
-         * @param context Android {@link Context} for engine to use.
-         * @param json JSON string of configuration parameters, which was
-         *         serialized using {@link #toString}.
-         */
-        public Builder(Context context, String json) throws JSONException {
-            mConfig = new JSONObject(json);
-            mContext = context;
-        }
-
-        /**
          * Constructs a User-Agent string including Cronet version, and
          * application name and version.
          *
@@ -336,8 +323,7 @@ public abstract class CronetEngine {
         /**
          * Get JSON string representation of the builder.
          */
-        @Override
-        public String toString() {
+        String toJSONString() {
             return mConfig.toString();
         }