[DevTools] Migrate inspector-protocol/debugger tests to new harness

third_party/WebKit/LayoutTests/inspector-protocol/debugger/step-into-inline-event-handler.js

+(async function(testRunner) {
+  let {page, session, dp} = await testRunner.startHTML(`
+    <script>
+    function testFunction() {
+      var e = document.getElementById('div');
+      debugger;
+      e.click();
+    }
+
+    function shouldNotBeThisFunction() {
+      return 239;
+    }
+    </script>
+    <div id='div' onclick='shouldNotBeThisFunction()'></div>
+  `, `Tests that Debugger.stepInto doesn't ignore inline event listeners.`);
+
+
+  function dumpTopCallFrame(result) {
+    var frame = result.params.callFrames[0];
+    testRunner.log('functionName (should be empty): ' + (frame.functionName.length ? frame.functionName : 'empty'));
+  }
+
+  await dp.Debugger.enable();
+  var finished = dp.Runtime.evaluate({expression: 'testFunction()'});
+
+  await dp.Debugger.oncePaused();
+  dp.Debugger.stepInto();
+  await dp.Debugger.oncePaused();
+  dp.Debugger.stepInto();
+  dumpTopCallFrame(await dp.Debugger.oncePaused());
+  dp.Debugger.resume();
+
+  await finished;
+  testRunner.completeTest();
+})