Make the extension's sidebar pane auto-resizable.

third_party/WebKit/Source/devtools/front_end/extensions/ExtensionPanel.js

Index: third_party/WebKit/Source/devtools/front_end/extensions/ExtensionPanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/extensions/ExtensionPanel.js b/third_party/WebKit/Source/devtools/front_end/extensions/ExtensionPanel.js
index bb16a44d51cc963c4a9e4d564376eb0ef16f889c..d1da688cf6b4a571ac9986586381a7a2b0c063dc 100644
--- a/third_party/WebKit/Source/devtools/front_end/extensions/ExtensionPanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/extensions/ExtensionPanel.js
@@ -192,6 +192,7 @@ WebInspector.ExtensionButton.prototype = {
 WebInspector.ExtensionSidebarPane = function(server, panelName, title, id)
 {
     WebInspector.SidebarPane.call(this, title);
+    this.element.classList.add("fill");
     this._panelName = panelName;
     this._server = server;
     this._id = id;
@@ -252,17 +253,6 @@ WebInspector.ExtensionSidebarPane.prototype = {
 
         this._extensionView = new WebInspector.ExtensionView(this._server, this._id, url, "extension fill");
         this._extensionView.show(this.element);
-
-        if (!this.element.style.height)
-            this.setHeight("150px");
-    },
-
-    /**
-     * @param {string} height
-     */
-    setHeight: function(height)
-    {
-        this.element.style.height = height;
     },
 
     /**