Web Inspector: Fix ESLint no-extra-semi

Web Inspector: Fix ESLint no-extra-semi
https://bugs.webkit.org/show_bug.cgi?id=136666

Reviewed by Andy Estes.

Add explicit no-extra-semi rule to .eslintrc. Remove all unnecessary
semicolons as identified by ESLint.

* .eslintrc:
* Tools/PrettyPrinting/Formatter.js:
(Formatter):
* UserInterface/Controllers/Formatter.js:
(Formatter):
* UserInterface/Models/Resource.js:
(WebInspector.Resource.prototype.getImageSize.imageDidLoad):
(WebInspector.Resource.prototype.getImageSize):
* UserInterface/Views/LayerTreeSidebarPanel.js:
(WebInspector.LayerTreeSidebarPanel.prototype._sortDataGrid.comparator):
(WebInspector.LayerTreeSidebarPanel.prototype._sortDataGrid):
* UserInterface/Views/ObjectPropertiesSection.js:
(WebInspector.ObjectPropertyTreeElement.prototype.callback):
(WebInspector.ObjectPropertyTreeElement.prototype.applyExpression):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@173432 268f45cc-cd09-0410-ab3c-d52691b4dbfc