[DevTools] Add preferred size to WebInspector.View.

Source/devtools/front_end/SourcesView.js

Index: Source/devtools/front_end/SourcesView.js
diff --git a/Source/devtools/front_end/SourcesView.js b/Source/devtools/front_end/SourcesView.js
index da99a3a3388b45f9c2051d7689cb0bfd0a9df309..f7d07e00d637ac424de02fe8be9077372d3ad328 100644
--- a/Source/devtools/front_end/SourcesView.js
+++ b/Source/devtools/front_end/SourcesView.js
@@ -16,7 +16,7 @@ WebInspector.SourcesView = function(workspace, sourcesPanel)
     WebInspector.VBox.call(this);
     this.registerRequiredCSS("sourcesView.css");
     this.element.id = "sources-panel-sources-view";
-    this.setMinimumSize(50, 25);
+    this.setConstraints(50, 25, 150, 100);
 
     this._workspace = workspace;
     this._sourcesPanel = sourcesPanel;