[DevTools] Add preferred size to WebInspector.View.

Source/devtools/front_end/SourcesPanel.js

Index: Source/devtools/front_end/SourcesPanel.js
diff --git a/Source/devtools/front_end/SourcesPanel.js b/Source/devtools/front_end/SourcesPanel.js
index e617973d7bc8b7143647d1f6f423ba6e747f9ccc..39588f229757d6622a1653392124867cedbbaab5 100644
--- a/Source/devtools/front_end/SourcesPanel.js
+++ b/Source/devtools/front_end/SourcesPanel.js
@@ -84,7 +84,7 @@ WebInspector.SourcesPanel = function(workspaceForTest)
     this.editorView.show(this._splitView.mainElement());
 
     this._navigator = new WebInspector.SourcesNavigator(this._workspace);
-    this._navigator.view.setMinimumSize(Preferences.minSidebarWidth, 25);
+    this._navigator.view.setConstraints(Preferences.minSidebarWidth, 25);
     this._navigator.view.show(this.editorView.sidebarElement());
     this._navigator.addEventListener(WebInspector.SourcesNavigator.Events.SourceSelected, this._sourceSelected, this);
     this._navigator.addEventListener(WebInspector.SourcesNavigator.Events.SourceRenamed, this._sourceRenamed, this);
@@ -996,7 +996,7 @@ WebInspector.SourcesPanel.prototype = {
         vbox.element.appendChild(this._debugToolbarDrawer);
         vbox.element.appendChild(this.debugToolbar);
         vbox.element.appendChild(this.threadsToolbar.element);
-        vbox.setMinimumSize(WebInspector.SourcesPanel.minToolbarWidth, 25);
+        vbox.setConstraints(25, 25, WebInspector.SourcesPanel.minToolbarWidth, 100);
         var sidebarPaneStack = new WebInspector.SidebarPaneStack();
         sidebarPaneStack.element.classList.add("flex-auto");
         sidebarPaneStack.show(vbox.element);