Fully deprecate core.js. Moved last method to error.js.

ios/web/web_state/js/resources/error.js

+// Copyright 2017 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.
+
+/**
+ * @fileoverview Error handling APIs and listeners.
+ */
+
+goog.provide('__crWeb.error');
+
+goog.require('__crWeb.message');
+
+/** Beginning of anonymouse object */
+(function() {
+
+  /**
+   * JavaScript errors are logged on the main application side. The handler is
+   * added ASAP to catch any errors in startup. Note this does not appear to

[Eugene But (OOO till 7-30), 2017/04/13 16:30:06]

Could you please drop "Note this does not appear to work in iOS < 5." Currently
minimum supported iOS version is 9.

[danyao, 2017/04/13 17:40:45]

Done.

+   * work in iOS < 5.
+   */
+  window.addEventListener('error', function(event) {
+    // Sadly, event.filename and event.lineno are always 'undefined' and '0'

[Eugene But (OOO till 7-30), 2017/04/13 16:30:06]

WKWebView may support this now. Could you please file a bug and add a TODO for
this.

[danyao, 2017/04/13 17:40:45]

Done.

+    // with UIWebView.
+    __gCrWeb.message.invokeOnHost(
+        {'command': 'window.error', 'message': event.message.toString()});
+  });
+
+  // Flush the message queue.
+  if (__gCrWeb.message) {
+    __gCrWeb.message.invokeQueues();
+  }
+
+}());  // End of anonymous object