[debugger] remove mirror cache and v8::Debug::GetMirror.

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 220 matching lines @@
 
 /** @return {number} */
 FrameDetails.prototype.sourcePosition = function() {}
 
 /** @return {*} */
 FrameDetails.prototype.returnValue = function() {}
 
 /** @return {number} */
 FrameDetails.prototype.scopeCount = function() {}
 
-
-/** @param {boolean} value */
-function ToggleMirrorCache(value) {}
-
 /**
  * @param {*} value
- * @param {boolean=} transient
  * @return {!Mirror}
  */
-function MakeMirror(value, transient) {}
+function MakeMirror(value) {}
 
 
 /** @interface */
 function Mirror() {}
 
 /** @return {boolean} */
 Mirror.prototype.isFunction = function() {}
 
 /** @return {boolean} */
 Mirror.prototype.isGenerator = function() {}
@@ skipping 201 matching lines @@
 ScopeMirror.prototype.setVariableValue = function(name, newValue) {}
 
 /**
  * @interface
  * @extends {Mirror}
  */
 function ContextMirror() {}
 
 /** @return {string|undefined} */
 ContextMirror.prototype.data = function() {}