[Cronet] Fix up log TAGs to be accurate and prevent future inaccuracies.

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

 // Copyright 2016 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.impl;
 
 import android.annotation.SuppressLint;
 import android.util.Log;
 import android.util.Pair;
 
 import org.chromium.net.CronetEngine;
 import org.chromium.net.ExperimentalUrlRequest;
 import org.chromium.net.UploadDataProvider;
 import org.chromium.net.UrlRequest;
 
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.concurrent.Executor;
 
 /**
  * Implements {@link org.chromium.net.ExperimentalUrlRequest.Builder}.
  */
 public class UrlRequestBuilderImpl extends ExperimentalUrlRequest.Builder {
     private static final String ACCEPT_ENCODING = "Accept-Encoding";
-    private static final String TAG = "UrlRequestBuilder";
+    private static final String TAG = UrlRequestBuilderImpl.class.getSimpleName();
 
     // All fields are temporary storage of ExperimentalUrlRequest configuration to be
     // copied to built ExperimentalUrlRequest.
 
     // CronetEngineBase to execute request.
     private final CronetEngineBase mCronetEngine;
     // URL to request.
     private final String mUrl;
     // Callback to receive progress callbacks.
     private final UrlRequest.Callback mCallback;
@@ skipping 144 matching lines @@
         }
         for (Pair<String, String> header : mRequestHeaders) {
             request.addHeader(header.first, header.second);
         }
         if (mUploadDataProvider != null) {
             request.setUploadDataProvider(mUploadDataProvider, mUploadDataProviderExecutor);
         }
         return request;
     }
 }