Remove blink_perf.pywebsocket tests

third_party/WebKit/PerformanceTests/Pywebsocket/resources/util_performance_test.js

-const numIterations = 10;
-const numWarmUpIterations = 5;
-
-function startPerformanceTest(connectionType, benchmarkName,
-    dataType, isWorker, async, verifyData){
-  var iframe = document.createElement('iframe');
-  if (connectionType === 'WebSocket') {
-    iframe.src = "http://localhost:8001/performance_test_iframe.html";
-  } else if (connectionType === 'XHR') {
-    iframe.src = "http://localhost:8001/xhr_performance_test_iframe.html";
-  } else {
-    iframe.src = "http://localhost:8001/fetch_performance_test_iframe.html";
-  }
-  iframe.onload = function() {
-    var child = iframe.contentWindow;
-    PerfTestRunner.prepareToMeasureValuesAsync({
-        done: function() {
-          child.postMessage({'command': 'stop'},
-                            'http://localhost:8001');
-        },
-        unit: 'ms',
-        iterationCount: numIterations
-    });
-
-    child.postMessage({'command': 'start',
-                       'connectionType': connectionType,
-                       'benchmarkName': benchmarkName,
-                       'dataType': dataType,
-                       'isWorker': isWorker,
-                       'async': async,
-                       'verifyData': verifyData,
-                       'numIterations': numIterations,
-                       'numWarmUpIterations': numWarmUpIterations},
-                      'http://localhost:8001');
-  };
-  document.body.appendChild(iframe);
-}
-
-onmessage = function(message) {
-  if (message.data.command === 'log') {
-    PerfTestRunner.log(message.data.value);
-  } else if (message.data.command === 'measureValue') {
-    PerfTestRunner.measureValueAsync(message.data.value);
-    PerfTestRunner.gc();
-  } else if (message.data.command === 'notifyAbort') {
-    PerfTestRunner.logFatalError("benchmark aborted");
-  }
-};