Remove SplitInDrawer experiment

With the removal of the terminal, we no longer need this experiment.

BUG=1011466

Change-Id: I0c097d33d09329eae41079504d825041f082e1fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866930
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Paul Irish <paulirish@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707292}

third_party/blink/renderer/devtools/front_end/main/Main.js

@@ -136,7 +136,6 @@ Main.Main = class {
         'recordCoverageWithPerformanceTracing', 'Record coverage while performance tracing');
     Root.Runtime.experiments.register('samplingHeapProfilerTimeline', 'Sampling heap profiler timeline', true);
     Root.Runtime.experiments.register('sourceDiff', 'Source diff');
-    Root.Runtime.experiments.register('splitInDrawer', 'Split in drawer', true);
     Root.Runtime.experiments.register('spotlight', 'Spotlight', true);
 
     // Timeline

third_party/blink/renderer/devtools/front_end/ui/InspectorView.js

@@ -44,16 +44,6 @@ export default class InspectorView extends UI.VBox {
     this._drawerSplitWidget.enableShowModeSaving();
     this._drawerSplitWidget.show(this.element);
 
-    if (Root.Runtime.experiments.isEnabled('splitInDrawer')) {
-      this._innerDrawerSplitWidget = new UI.SplitWidget(true, true, 'Inspector.drawerSidebarSplitViewState', 200, 200);
-      this._drawerSplitWidget.setSidebarWidget(this._innerDrawerSplitWidget);
-      this._drawerSidebarTabbedLocation =
-          UI.viewManager.createTabbedLocation(this._showDrawer.bind(this, false), 'drawer-sidebar', true, true);
-      this._drawerSidebarTabbedPane = this._drawerSidebarTabbedLocation.tabbedPane();
-      this._drawerSidebarTabbedPane.addEventListener(UI.TabbedPane.Events.TabSelected, this._drawerTabSelected, this);
-      this._innerDrawerSplitWidget.setSidebarWidget(this._drawerSidebarTabbedPane);
-    }
-
     // Create drawer tabbed pane.
     this._drawerTabbedLocation =
         UI.viewManager.createTabbedLocation(this._showDrawer.bind(this, false), 'drawer-view', true, true);
@@ -66,14 +56,8 @@ export default class InspectorView extends UI.VBox {
     this._drawerSplitWidget.installResizer(this._drawerTabbedPane.headerElement());
     this._drawerTabbedPane.addEventListener(UI.TabbedPane.Events.TabSelected, this._drawerTabSelected, this);
 
-    if (this._drawerSidebarTabbedPane) {
-      this._innerDrawerSplitWidget.setMainWidget(this._drawerTabbedPane);
-      this._drawerSidebarTabbedPane.rightToolbar().appendToolbarItem(closeDrawerButton);
-      this._drawerSplitWidget.installResizer(this._drawerSidebarTabbedPane.headerElement());
-    } else {
-      this._drawerSplitWidget.setSidebarWidget(this._drawerTabbedPane);
-      this._drawerTabbedPane.rightToolbar().appendToolbarItem(closeDrawerButton);
-    }
+    this._drawerSplitWidget.setSidebarWidget(this._drawerTabbedPane);
+    this._drawerTabbedPane.rightToolbar().appendToolbarItem(closeDrawerButton);
 
     // Create main area tabbed pane.
     this._tabbedLocation = UI.viewManager.createTabbedLocation(
@@ -140,9 +124,6 @@ export default class InspectorView extends UI.VBox {
     if (locationName === 'panel') {
       return this._tabbedLocation;
     }
-    if (locationName === 'drawer-sidebar') {
-      return this._drawerSidebarTabbedLocation;
-    }
     return null;
   }