Merge 98243 - Web Inspector: [Styles] Adding a new style rule breaks things

Merge 98243 - Web Inspector: [Styles] Adding a new style rule breaks things
https://bugs.webkit.org/show_bug.cgi?id=70721

Reviewed by Pavel Feldman.

Source/WebCore:

We had used to swap BlankStylePropertiesSection prototype and recently got rid of this hack,
but still had dependencies on the old behavior.

* inspector/front-end/StylesSidebarPane.js:
(WebInspector.StylesSidebarPane.prototype._refreshStyleRules):
(WebInspector.ComputedStylePropertiesSection.prototype.rebuildComputedTrace):
(WebInspector.BlankStylePropertiesSection.prototype.get isBlank):
(WebInspector.BlankStylePropertiesSection.prototype.expand):
(WebInspector.BlankStylePropertiesSection.prototype.editingSelectorCommitted.successCallback):
(WebInspector.BlankStylePropertiesSection.prototype.editingSelectorCommitted):
(WebInspector.BlankStylePropertiesSection.prototype.editingSelectorCancelled):
(WebInspector.BlankStylePropertiesSection.prototype.makeNormal):

LayoutTests:

* inspector/styles/styles-add-new-rule-expected.txt:
* inspector/styles/styles-add-new-rule.html:

TBR=apavlov@chromium.org
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=98248