[inspector] Refactor protocol-test.js

test/inspector/debugger/get-possible-breakpoints-restrict-to-function.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.
 
-InspectorTest.log('Checks Debugger.getPossibleBreakpoints with ignoreNestedFunctions');
+let {session, contextGroup, Protocol} = InspectorTest.start('Checks Debugger.getPossibleBreakpoints with ignoreNestedFunctions');
 
 var source = `
 function test() {
   Array.from([1,2]).map(() => 1).filter(() => true);
   function nested1() {
     Array.from([1,2]).map(() => 1).filter(() => true);
   }
   function nested2() {
     Array.from([1,2]).map(() => 1).filter(() => true);
   }
   nested1();
   nested2();
 }
 //# sourceURL=test.js`;
-InspectorTest.addScript(source);
+contextGroup.addScript(source);
 
 var scriptId;
 Protocol.Debugger.onceScriptParsed().then(message => {
   if (message.params.url === 'test.js')
     scriptId = message.params.scriptId;
 }).then(() => InspectorTest.runTestSuite(tests));
 
-InspectorTest.setupScriptMap();
+session.setupScriptMap();
 Protocol.Debugger.onPaused(dumpBreakLocationInSourceAndResume);
 
 Protocol.Debugger.enable();
 var tests = [
   function testWholeFunction(next) {
     Protocol.Debugger.getPossibleBreakpoints({ start: location(1, 18), ignoreNestedFunctions: false })
       .then(dumpAllLocations)
       .then(next);
   },
 
@@ skipping 57 matching lines @@
     var offset = lineOffsets[lineNumber];
     line = line.slice(0, columnNumber + offset) + '#' + line.slice(columnNumber + offset);
     ++lineOffsets[lineNumber];
     sourceLines[lineNumber] = line;
   }
   InspectorTest.log(sourceLines.join('\n'));
   return message;
 }
 
 function dumpBreakLocationInSourceAndResume(message) {
-  InspectorTest.logCallFrames([ message.params.callFrames[0] ]);
+  session.logCallFrames([ message.params.callFrames[0] ]);
 
   var location = message.params.callFrames[0].location;
   var sourceLines = source.split('\n')
 
   var lineNumber = location.lineNumber
   var columnNumber = location.columnNumber;
 
   var line = sourceLines[lineNumber];
   line = line.slice(0, columnNumber) + '^' + line.slice(columnNumber);
   sourceLines[lineNumber] = line;
   InspectorTest.log(sourceLines.join('\n'));
   InspectorTest.log('');
   Protocol.Debugger.resume();
 }