Web Inspector: Inherit SidebarPane from View.
https://bugs.webkit.org/show_bug.cgi?id=108075

Patch by Vladislav Kaznacheev <kaznacheev@chromium.org> on 2013-01-28
Reviewed by Pavel Feldman.

Inherited WebInspector.SidebarPane from WebInspector.View to streamlines the code and
simplify further enhancements to sidebar panes. Got rid of obsolete onattach calls.

No new tests.

* inspector/front-end/AuditResultView.js:
(WebInspector.AuditResultView):
* inspector/front-end/ElementsPanel.js:
(WebInspector.ElementsPanel):
(WebInspector.ElementsPanel.prototype.wasShown):
(WebInspector.ElementsPanel.prototype.willHide):
* inspector/front-end/ExtensionServer.js:
(WebInspector.ExtensionServer.prototype._onCreateSidebarPane):
* inspector/front-end/ScriptsPanel.js:
(WebInspector.ScriptsPanel):
(WebInspector.ScriptsPanel.prototype.wasShown):
* inspector/front-end/SidebarPane.js:
(WebInspector.SidebarPane):
* inspector/front-end/WatchExpressionsSidebarPane.js:
(WebInspector.WatchExpressionsSidebarPane.prototype._refreshExpressionsIfNeeded):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140968 268f45cc-cd09-0410-ab3c-d52691b4dbfc