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

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.net;
 
 import android.content.Context;
 import android.support.annotation.IntDef;
 import android.util.Log;
 
@@ skipping 35 matching lines @@
             mConfig = new JSONObject();
             mContext = context;
             enableLegacyMode(false);
             enableQUIC(false);
             enableHTTP2(true);
             enableSDCH(false);
             enableHttpCache(HTTP_CACHE_DISABLED, 0);
         }
 
         /**
-         * 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.
          *
          * @return User-Agent string.
          */
         public String getDefaultUserAgent() {
             return UserAgent.from(mContext);
         }
 
         /**
@@ skipping 250 matching lines @@
          * Sets a native MockCertVerifier for testing.
          */
         Builder setMockCertVerifierForTesting(long mockCertVerifier) {
             return putString(
                     CronetEngineBuilderList.MOCK_CERT_VERIFIER, String.valueOf(mockCertVerifier));
         }
 
         /**
          * Get JSON string representation of the builder.
          */
-        @Override
-        public String toString() {
+        String toJSONString() {
             return mConfig.toString();
         }
 
         /**
          * Returns {@link Context} for builder.
          *
          * @return {@link Context} for builder.
          */
         Context getContext() {
             return mContext;
@@ skipping 324 matching lines @@
                 cronetEngine = possibleEngine;
             }
         } catch (ClassNotFoundException e) {
             // Leave as null.
         } catch (Exception e) {
             throw new IllegalStateException("Cannot instantiate: " + CRONET_URL_REQUEST_CONTEXT, e);
         }
         return cronetEngine;
     }
 }