Inline usages of peekLast in DevTools tests

R=szuend@chromium.org

Bug: 1050549
Change-Id: I763f8596ab931c97a5b15dcd2639f59baab2763b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627412
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842985}

third_party/blink/web_tests/http/tests/devtools/components/viewport-datagrid.js

@@ -165,7 +165,7 @@
   var children = root.children.slice();
   root.removeChildren();
   // Assure wheelTarget is anything but null, otherwise it happily bypasses crashing code.
-  dataGrid._wheelTarget = children.peekLast().element;
+  dataGrid._wheelTarget = children[children.length - 1].element;
   for (var i = 0; i < 40; ++i) {
     children[i].refresh();
     root.appendChild(children[i]);

third_party/blink/web_tests/http/tests/devtools/extensions/extensions-timeline-api.js

@@ -8,7 +8,8 @@
   await TestRunner.showPanel('timeline');
 
   TestRunner.enableTimelineExtensionAndStart = function(callback) {
-    const provider = Extensions.extensionServer.traceProviders().peekLast();
+    const traceProviders = Extensions.extensionServer.traceProviders();
+    const provider = traceProviders[traceProviders.length - 1];
     const timelinePanel = UI.panels.timeline;
     const setting = Timeline.TimelinePanel._settingForTraceProvider(provider);
     setting.set(true);

third_party/blink/web_tests/http/tests/devtools/network/parse-form-data.js

@@ -23,7 +23,8 @@
     TestRunner.evaluateInPage('document.querySelector("form").submit();');
     await snifferPromise;
 
-    var request = NetworkTestRunner.networkRequests().peekLast();
+    const networkRequests = NetworkTestRunner.networkRequests();
+    var request = networkRequests[networkRequests.length - 1];
     if (request.url().endsWith('/')) {
       await TestRunner.addSnifferPromise(SDK.NetworkDispatcher.prototype, 'requestWillBeSent');
       request = NetworkTestRunner.networkRequests().pop();

third_party/blink/web_tests/http/tests/devtools/network/ping.js

@@ -22,7 +22,8 @@
   TestRunner.evaluateInPage('navigateLink()');
   await snifferPromise;
 
-  var request = NetworkTestRunner.networkRequests().peekLast();
+  const networkRequests = NetworkTestRunner.networkRequests();
+  var request = networkRequests[networkRequests.length - 1];
   if (request.url().endsWith('/')) {
     await TestRunner.addSnifferPromise(SDK.NetworkDispatcher.prototype, 'requestWillBeSent');
     request = NetworkTestRunner.networkRequests().pop();

third_party/blink/web_tests/http/tests/devtools/tracing/frame-model-instrumentation.js

@@ -13,7 +13,7 @@
   UI.panels.timeline._captureLayersAndPicturesSetting.set(true);
   await PerformanceTestRunner.invokeAsyncWithTimeline('doActions');
   const frames = PerformanceTestRunner.timelineFrameModel().frames();
-  const lastFrame = PerformanceTestRunner.timelineFrameModel().frames().peekLast();
+  const lastFrame = frames[frames.length - 1];
   if (lastFrame) {
     TestRunner.addResult('layerTree: ' + typeof lastFrame.layerTree);
     TestRunner.addResult('mainFrameId: ' + typeof lastFrame._mainFrameId);

third_party/blink/web_tests/http/tests/devtools/tracing/timeline-paint/layer-tree.js

@@ -35,7 +35,7 @@
 
   await PerformanceTestRunner.invokeAsyncWithTimeline('doActions');
   const frames = PerformanceTestRunner.timelineFrameModel().frames();
-  const lastFrame = PerformanceTestRunner.timelineFrameModel().frames().peekLast();
+  const lastFrame = frames[frames.length - 1];
   const layerTreeModel = await lastFrame.layerTree.layerTreePromise();
   LayersTestRunner.dumpLayerTree(undefined, layerTreeModel.contentRoot());