[test/inspector] remove any usage of v8::Extension

test/inspector/debugger/framework-stepping.js

 // Copyright 2017 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.
 
 InspectorTest.log('Checks stepping with blackboxed frames on stack');
 
 InspectorTest.addScript(
     `
 function frameworkCall(funcs) {
   for (var f of funcs) f();
 }
 
 function frameworkBreakAndCall(funcs) {
-  breakProgram('', '');
+  inspector.breakProgram('', '');
   for (var f of funcs) f();
 }
 //# sourceURL=framework.js`,
     8, 4);
 
 InspectorTest.addScript(
     `
 function userFoo() {
   return 1;
 }
@@ skipping 79 matching lines @@
       InspectorTest.logCallFrames(message.params.callFrames);
       InspectorTest.log('');
       action = actions.shift() || 'resume';
     }
     if (action) InspectorTest.log(`Executing ${action}...`);
     Protocol.Debugger[action]();
   });
   return Protocol.Runtime.evaluate(
       {expression: entryExpression + '//# sourceURL=expr.js'});
 }