[inspector] Refactor inspector test

test/inspector/debugger/inspector-break-api.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 breakProgram,(schedule|cancel)PauseOnNextStatement test API");
 
 InspectorTest.addScript(`
 function callBreakProgram() {
   inspector.breakProgram('reason', JSON.stringify({a: 42}));
 }
@@ skipping 15 matching lines @@
 
 Protocol.Debugger.enable();
 
 InspectorTest.runTestSuite([
   function testBreakProgram(next) {
     Protocol.Runtime.evaluate({ expression: 'callBreakProgram()'})
       .then(next);
   },
 
   function testSchedulePauseOnNextStatement(next) {
-    utils.schedulePauseOnNextStatement('reason', JSON.stringify({a: 42}));
+    InspectorTest.contextGroup.schedulePauseOnNextStatement('reason', JSON.stringify({a: 42}));
     Protocol.Runtime.evaluate({ expression: 'foo()//# sourceURL=expr1.js'})
       .then(() => Protocol.Runtime.evaluate({
         expression: 'foo()//# sourceURL=expr2.js'}))
-      .then(() => utils.cancelPauseOnNextStatement())
+      .then(() => InspectorTest.contextGroup.cancelPauseOnNextStatement())
       .then(next);
   },
 
   function testCancelPauseOnNextStatement(next) {
-    utils.schedulePauseOnNextStatement('reason', JSON.stringify({a: 42}));
-    utils.cancelPauseOnNextStatement();
+    InspectorTest.contextGroup.schedulePauseOnNextStatement('reason', JSON.stringify({a: 42}));
+    InspectorTest.contextGroup.cancelPauseOnNextStatement();
     Protocol.Runtime.evaluate({ expression: 'foo()'})
       .then(next);
   }
 ]);