[inspector] removed embbeder debugger script flag

src/inspector/debugger_script_externs.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** @typedef {{
         type: string,
         object: !Object,
         name: (string|undefined),
         startLocation: (!RawLocation|undefined),
         endLocation: (!RawLocation|undefined)
@@ skipping 221 matching lines @@
  *    end: number,
  *    }}
  */
 var SourceLocation;
 
 /** @typedef{{
  *    id: number,
  *    context_data: (string|undefined),
  *    source_url: (string|undefined),
  *    source_mapping_url: (string|undefined),
- *    is_debugger_script: boolean,
  *    source: string,
  *    line_offset: number,
  *    column_offset: number,
  *    nameOrSourceURL: function():string,
  *    compilationType: function():!ScriptCompilationType,
  *    }}
  */
 var Script;
 
 /** @interface */
@@ skipping 249 matching lines @@
 ScopeMirror.prototype.setVariableValue = function(name, newValue) {}
 
 /**
  * @interface
  * @extends {Mirror}
  */
 function ContextMirror() {}
 
 /** @return {string|undefined} */
 ContextMirror.prototype.data = function() {}