Web Inspector: convert styles panel into UISourceCodeProvider in the scripts panel.

Web Inspector: convert styles panel into UISourceCodeProvider in the scripts panel.
https://bugs.webkit.org/show_bug.cgi?id=86734

Reviewed by Vsevolod Vlasov.

This change also makes Scripts render ans Source Code under that experiment.

* English.lproj/localizedStrings.js:
* inspector/front-end/ScriptsNavigator.js:
(WebInspector.ScriptsNavigator):
* inspector/front-end/ScriptsPanel.js:
(WebInspector.ScriptsPanel.prototype.get toolbarItemLabel):
(WebInspector.ScriptsPanel.prototype.canShowAnchorLocation):
(WebInspector.ScriptsPanel.prototype._createSourceFrame):
* inspector/front-end/Settings.js:
(WebInspector.ExperimentsSettings):
* inspector/front-end/StylesPanel.js:
(WebInspector.StylesUISourceCodeProvider):
(WebInspector.StylesUISourceCodeProvider.prototype.uiSourceCodes):
(WebInspector.StylesUISourceCodeProvider.prototype._initialize):
(WebInspector.StylesUISourceCodeProvider.prototype._resourceAdded):
(WebInspector.StylesUISourceCodeProvider.prototype._reset):
(WebInspector.StyleSource):
(WebInspector.StyleSourceFrame):
(WebInspector.StyleSourceFrame.prototype.canEditSource):
(WebInspector.StyleSourceFrame.prototype.requestContent):
(WebInspector.StyleSourceFrame.prototype.commitEditing):
(WebInspector.StyleSourceFrame.prototype.afterTextChanged):
(WebInspector.StyleSourceFrame.prototype._clearIncrementalUpdateTimer):
(WebInspector.StyleSourceFrame.prototype._contentChanged):
* inspector/front-end/StylesSidebarPane.js:
(WebInspector.StylePropertiesSection):
(WebInspector.StylePropertiesSection.prototype._createRuleOriginNode):
* inspector/front-end/UISourceCode.js:
* inspector/front-end/inspector.js:
(WebInspector._createPanels):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117452 268f45cc-cd09-0410-ab3c-d52691b4dbfc