[Devtools] Type externs global namespaces

third_party/WebKit/Source/devtools/front_end/components/JavaScriptAutocomplete.js

 // 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.
 
 Components.JavaScriptAutocomplete = {};
 
 /** @typedef {{title:(string|undefined), items:Array<string>}} */
 Components.JavaScriptAutocomplete.CompletionGroup;
 
 /**
@@ skipping 58 matching lines @@
 
   // User is creating an array, do not suggest anything.
   if (bracketNotation && !expressionString)
     return Promise.resolve([]);
 
   if (!query && !expressionString && !force)
     return Promise.resolve([]);
 
   var fufill;
   var promise = new Promise(x => fufill = x);
-  if (!expressionString && executionContext.debuggerModel.selectedCallFrame())
-    variableNamesInScopes(executionContext.debuggerModel.selectedCallFrame(), receivedPropertyNames);
+  var selectedFrame = executionContext.debuggerModel.selectedCallFrame();
+  if (!expressionString && selectedFrame)
+    variableNamesInScopes(selectedFrame, receivedPropertyNames);
   else
     executionContext.evaluate(expressionString, 'completion', true, true, false, false, false, evaluated);
 
   return promise;
   /**
    * @param {?SDK.RemoteObject} result
    * @param {!Protocol.Runtime.ExceptionDetails=} exceptionDetails
    */
   function evaluated(result, exceptionDetails) {
     if (!result || !!exceptionDetails) {
@@ skipping 234 matching lines @@
     var structuredGroup =
         caseSensitivePrefix.concat(caseInsensitivePrefix, caseSensitiveAnywhere, caseInsensitiveAnywhere);
     if (structuredGroup.length && group.title !== lastGroupTitle) {
       structuredGroup[0].subtitle = group.title;
       lastGroupTitle = group.title;
     }
     result = result.concat(structuredGroup);
   }
   return result;
 };